Extensión:AbuseFilter/Reglas de formato

Las reglas son un lenguaje especial. Tienen un formato similar a los condicionales en lenguajes como C, Java o Perl.

Cadenas

Puedes especificar un literal por colocar él en solo o doble cita (para configuraciones), o escribir en él (para números, ambos flotantes-punto y entero). Puedes obtener saltos de línea con \n, caracteres de tabulación con \t y también puede escapar del carácter de comillas con una barra invertida.

Utilice el símbolo de + (más) para concatenar dos cadenas literales o los valores de dos variables con un valor de cadena.

Ejemplos

"Este es una cadena"
'Esto también es una cadena'
'Esta cadena no deber\ía fallar'
"Esta cadena\nTiene un salto de línea"
1234
1.234
-123

Variables definidas por el usuario

Puede definir variables personalizados para facilitar la comprensión con el símbolo de asignación := en una línea (cerrada por ;) dentro de una condición. Dichas variables pueden usar letras, guiones bajos y números (aparte del primer carácter) y no distinguen entre mayúsculas y minúsculas. Ejemplo (de w:Special:AbuseFilter/79):

(
	line1:="(\{\{(r|R)eflist|\{\{(r|R)efs|<references\s?/>|</references\s?>)";
	rcount(line1, removed_lines)
) > (
	rcount(line1, added_lines)
)

Arrays

AbuseFilter has support for non-associative arrays, which can be used like in the following examples.

Atención:

Expressions like page_namespace in [14, 15] may not work as expected. This one will evaluate to true also if page_namespace is 1, 4, or 5. For more information and possible workarounds, please see T181024.

my_array := [ 5, 6, 7, 10 ];
my_array[0] == 5
length(my_array) == 4
int( my_array ) === 4 // Same as length
float( my_array ) === 4.0 // Cuenta los elementos
string(my_array) == "5\n6\n7\n10\n" // Note: the last linebreak could be removed in the future
5 in my_array == true
'5' in my_array == true
'5\n6' in my_array == true // Note: this is due to how arrays are casted to string, i.e. by imploding them with linebreaks
1 in my_array == true // Note: this happens because 'in' casts arguments to strings, so the 1 is caught in '10' and returns true.
my_array[] := 57; // This appends an element at the end of the array
my_array === [ 5, 6, 7, 10, 57 ]
my_array[2] := 42; // And this is for changing an element in the array
my_array === [ 5, 6, 42, 10, 57 ]

Comentarios

Puedes añadir comentarios usando la siguiente sintaxis:

/* Esto es un comentario */

Aritmética

Puede hacer aritmética en variables y literales con la siguiente sintaxis:

• - — Sustraer (restar) el operando de la derecha al de la izquierda.
• + — Suma el operando de la derecha al de la izquierda.
• * — Multiplica el operando de la derecha al de la izquierda
• / — Divide el operando de la derecha al de la izquierda
• ** — Exponenciación en el operando de la derecha al de la izquierda.
• % — Devuelve el resto obtenido al dividir el operando de la izquierda al de la derecha.

El tipo del resultado devuelto es el mismo que sería devuelto por PHP, para el cual se puede encontrar mucha documentación en línea. Se pueden encontrar ejemplos más exhaustivos en AF parser.

Ejemplo	Resultado
1 + 1	2
2 * 2	4
1 / 2	0.5
9 ** 2	81
6 % 5	1

Operadores booleanos

Se puede igualar si y sólo si todas las condiciones son ciertas, una de varias condiciones es verdad, o una y sólo una de todas las condiciones es verdad.

• x | y — OR – devuelve verdad si una o más de las condiciones son ciertas.
• x & y — AND – devuelve verdad si ambas condiciones son ciertas.
• x ^ y — XOR – devuelve verdadero si una, y sólo una, de las dos condiciones es verdadera.
• !x — NOT – devuelve verdad si la condición no es verdadera.

Ejemplos

Código	Resultado
1 | 1	true
1 | 0	true
0 | 0	false
1 & 1	true
1 & 0	false
0 & 0	false
1 ^ 1	false
1 ^ 0	true
0 ^ 0	false
!1	false
!0	true

Simple comparisons

You can compare variables with other variables and literals with the following syntax:

• <, > — Return true if the left-hand operand is less than/greater than the right-hand operand respectively.

Watch out: operands are casted to strings and, like it happens in PHP, null < any number === true and null > any number === false.

• <=, >= — Return true if the left-hand operand is less than or equal to/greater than or equal to the right-hand operand respectively.

Watch out: operands are casted to strings and, like it happens in PHP, null <= any number === true and null >= any number === false.

• == (or =), != — Return true if the left-hand operand is equal to/not equal to the right-hand operand respectively.

• ===, !== — Return true if the left-hand operand is equal to/not equal to the right-hand operand AND the left-hand operand is the same/not the same data type to the right-hand operand respectively.

Ejemplo	Resultado
1 == 2	false
1 <= 2	true
1 >= 2	false
1 != 2	true
1 < 2	true
1 > 2	false
2 = 2	true
'' == false	true
'' === false	false
1 == true	true
1 === true	false
['1','2','3'] == ['1','2','3']	true
[1,2,3] === [1,2,3]	true
['1','2','3'] == [1,2,3]	true
['1','2','3'] === [1,2,3]	false
[1,1,''] == [true, true, false]	true
[] == false & [] == null	true
['1'] == '1'	false

Built-in variables

The abuse filter passes various variables by name into the parser. These variables can be accessed by typing their name in, in a place where a literal would work. You can view the variables associated with each request in the abuse log.

Variables de AbuseFilter

Variables always available

Atención:

User-related variables are always available, except for one case: account creation when the creator is not logged in. All variables starting with user_ are affected, except user_type.

Descripción	Nombre	Tipo de dato	Apuntes
Acción	action	cadena	One of the following: edit, move, createaccount, autocreateaccount, delete, upload, stashupload
Unix timestamp of change	timestamp	cadena	int(timestamp) gives you a number with which you can calculate the date, time, day of week, etc.
Nombre de la wiki en la base de datos	wiki_name	string	For instance, this is "enwiki" on the English Wikipedia, and "itwikiquote" on the Italian Wikiquote.
Código de idioma de la wiki	wiki_language	string	For instance, this is "en" on the English Wikipedia, and "it" on the Italian Wikiquote. Multi-lingual wikis like Commons, Meta, and Wikidata will also report as "en".
Contador de ediciones del usuario	user_editcount	integer/null	Null only for unregistered users.
Nombre de la cuenta de usuario (IP in case the user is not registered)	user_name	cadena	For "createaccount" and "autocreateaccount" actions, use accountname if you want the name of the account being created.
Tipo de cuenta de usuario	user_type	string	The type of the user, which will be one of ip, temp (if the user is using a temporary account ), named, external, or unknown.
El tiempo que hace que la dirección de correo electrónico fue confirmada	user_emailconfirm	string/null	In the format: YYYYMMDDHHMMSS. Null if the email wasn't confirmed.
Antigüedad de la cuenta de usuario	user_age	número entero	In seconds. 0 for unregistered users.
Si el usuario está bloqueado	user_blocked	booleano	True for blocked registered users. Also true for edits from blocked IP addresses, even if the editor is a registered user who is not blocked. False otherwise. This doesn't differentiate between partial and sitewide blocks.
Grupos (incluidos aquellos implícitos) a los que pertenece el usuario	user_groups	variedad de cadenas	Véase Special:ListGroupRights.
Derechos que tiene un usuario	user_rights	variedad de cadenas	Véase Special:ListGroupRights.
ID de la página	article_articleid	número entero	(desaprobado) Usa page_id en cambio.
ID de la página (can be seen via "page information" link in sidebar)	page_id	número entero	This is 0 for new pages, but it is unreliable when inspecting past hits. If you need an exact result when inspecting past hits, use "page_age == 0" to identify new page creation. (note that it is slower, though.) This issue has been fixed in 9369d08, merged on September 11th 2023.
Espacio de nombres de la página	article_namespace	número entero	(desaprobado) Usa page_namespace en cambio.
Espacio de nombres de la página	page_namespace	número entero	refers to namespace index . Check for namespace(s) using expressions like "page_namespace == 2" or "equals_to_any(page_namespace, 1, 3)"
Antigüedad de la página (en segundos)	page_age	entero	the number of seconds since the first edit (or 0 for new pages). This is reliable, but it tends to be slow; consider using page_id if you don't need much precision.
Título de página (sin espacio de nombres)	article_text	cadena	(desaprobado) Usa page_title en cambio.
Título de página (sin espacio de nombres)	page_title	cadena
Título completo de la página	article_prefixedtext	cadena	(desaprobado) Usa page_prefixedtitle en cambio.
Título completo de la página	page_prefixedtitle	cadena
Nivel de protección para la edición de la página	article_restrictions_edit	cadena	(desaprobado) Usa page_restrictions_edit en cambio.
Nivel de protección para la edición de la página	page_restrictions_edit	variedad de cadenas
Nivel de protección para el traslado de la página	article_restrictions_move	cadena	(desaprobado) Usa page_restrictions_move en cambio.
Nivel de protección para el traslado de la página	page_restrictions_move	variedad de cadenas
Nivel de protección para la subida del archivo	article_restrictions_upload	cadena	(desaprobado) Usa page_restrictions_upload en cambio.
Nivel de protección para la subida del archivo	page_restrictions_upload	variedad de cadenas
Nivel de protección para la creación de la página	article_restrictions_create	cadena	(desaprobado) Usa page_restrictions_create en cambio.
Nivel de protección para la creación de la página	page_restrictions_create	variedad de cadenas
Últimos diez usuarios en contribuir en la página	article_recent_contributors	array of strings	(desaprobado) Usa page_recent_contributors en cambio.
Últimos diez usuarios en contribuir en la página	page_recent_contributors	variedad de cadenas	This tends to be slow (see #Performance). Try to put conditions more likely evaluate to false before this one, to avoid unnecessarily running the query. This value is empty if the user is the only contributor to the page(?), and only scans the last 100 revisions
Primer usuario en contribuir en la página	article_first_contributor	cadena	(desaprobado) Usa page_first_contributor en cambio.
Primer usuario en contribuir en la página	page_first_contributor	cadena	This tends to be slow (see #Performance). Try to put conditions more likely evaluate to false before this one, to avoid unnecessarily running the query.

Variables available for some actions

Atención:

Always check that the variables you want to use are available for the current action being filtered, e.g. by using the action variable. Failing to do so (for instance using accountname for an edit, or edit_delta for a deletion) will make any code using the variable in question return false.

Edit variables are not available when examining past uploads.

Descripción	Nombre	Tipo de dato	Apuntes
Resumen de edición/razón	summary	cadena	Summaries automatically created by MediaWiki ("New section", "Blanked the page", etc.) are created after the filter checks the edit, so they will never actually catch, even if the debugger shows that they should. The variable contains whatever the user sees in the edit summary window, which may include MediaWiki preloaded section titles.
Si la edición ha sido marcada o no como menor (ya no se utiliza)	minor_edit	cadena	Disabled, and set to false for all entries between 2016 and 2018.
Antiguo wikitexto de la página, antes de la edición	old_wikitext	cadena	This variable can be very large. Consider using removed_lines if possible to improve performance.
Nuevo wikitexto de la página, después de la edición	new_wikitext	cadena	This variable can be very large. Consider using added_lines if possible to improve performance.
Diff unificado de los cambios realizados por la edición	edit_diff	cadena
Diff unificado de cambios por edición, preguardado transformado	edit_diff_pst	cadena	This tends to be slow (see #Performance). Checking both added_lines and removed_lines is probably more efficient.
Nuevo tamaño de la página	new_size	número entero
Antiguo tamaño de la página	old_size	entero
Cambio de tamaño en la edición	edit_delta	número entero
Líneas añadidas en la edición, la edición preguardada fue transformada	added_lines_pst	variedad de cadenas	Use added_lines if possible, which is more efficient.
Líneas añadidas en la edición	added_lines	variedad de cadenas	includes all lines in the final diff that begin with +
Líneas eliminadas en la edición	removed_lines	variedad de cadenas
Todos los enlaces externos en el nuevo texto	all_links	array of strings	This tends to be slow (see #Performance).
Enlaces en la página, antes de la edición	old_links	array of strings	This tends to be slow (see #Performance).
Todos los enlaces externos agregados en la edición	added_links	variedad de cadenas	This tends to be slow (see #Performance). Consider checking against added_lines first, then check added_links so that fewer edits are slowed down. This follows MediaWiki's rules for external links . Only unique links are added to the array. Changing a link will count as 1 added and 1 removed link.
Todos los enlaces externos eliminados en la edición	removed_links	variedad de cadenas	This tends to be slow (see #Performance). Consider checking against removed_lines first, then check removed_links so that fewer edits are slowed down. This follows MediaWiki's rules for external links . Only unique links are added to the array. Changing a link will count as 1 added and 1 removed link.
Nuevo wikitexto de la página, aplicando transformaciones preguardado	new_pst	cadena	This variable can be very large.
Fuente HTML analizada de la nueva revisión	new_html	cadena	This variable can be very large. Consider using added_lines if possible to improve performance.
Nuevo texto de página, libre de cualquier elemento de marcado	new_text	cadena	This variable can be very large. Consider using added_lines if possible to improve performance.
Antiguo wikitexto de la página, analizado en HTML (ya no se usa)	old_html	cadena	Disabled for performance reasons.
Texto antiguo de la página, libre de cualquier elemento de marcado (ya no se usa)	old_text	cadena	Disabled for performance reasons.
Hash SHA1 del contenido del archivo	file_sha1	cadena
Tamaño del archivo en bytes	file_size	número entero	The file size in bytes
Anchura del archivo en píxeles	file_width	número entero	The width in pixels
Altura del archivo en píxeles	file_height	número entero	The height in pixels
Bits por canal de color del archivo	file_bits_per_channel	número entero	The amount of bits per color channel
Tipo MIME del archivo	file_mime	string	The file MIME type.
Tipo del archivo multimedia	file_mediatype	string	The file media type.
ID de la página de destino del traslado	moved_to_articleid	número entero	(desaprobado) Usa moved_to_id en cambio.
ID de la página de destino del traslado	moved_to_id	número entero
Título de la página de destino del traslado	moved_to_text	cadena	(desaprobado) Usa moved_to_title en cambio.
Título de la página de destino del traslado	moved_to_title	cadena
Título completo de la página de destino del traslado	moved_to_prefixedtext	cadena	(desaprobado) Usa moved_to_prefixedtitle en cambio.
Título completo de la página de destino del traslado	moved_to_prefixedtitle	cadena
Espacio de nombres de la página de destino del traslado	moved_to_namespace	integer
Antigüedad de página destino del traslado (en segundos)	moved_to_age	número entero
Nivel de protección para la edición de la página destino del traslado	moved_to_restrictions_edit	array of string	Same as page_restrictions_edit, but for the target of the move.
Nivel de protección para el traslado de la página destino del traslado	moved_to_restrictions_move	array of string	Same as page_restrictions_move, but for the target of the move.
Nivel de protección para la subida del archivo destino del traslado	moved_to_restrictions_upload	array of string	Same as page_restrictions_upload, but for the target of the move.
Nivel de protección para el traslado de la página destino del traslado	moved_to_restrictions_create	array of string	Same as page_restrictions_create, but for the target of the move.
Últimos diez usuarios en contribuir en la página destino del traslado	moved_to_recent_contributors	array of strings	Same as page_recent_contributors, but for the target of the move.
Últimos diez usuarios en contribuir en la página original a trasladar	moved_to_first_contributor	string	Same as page_first_contributor, but for the target of the move.
Espacio de nombres de la página original a trasladar	moved_from_namespace	integer
Título de la página original a trasladar	moved_from_text	cadena	(desaprobado) Usa moved_from_title en cambio.
Título de la página original a trasladar	moved_from_title	cadena
Título completo de la página original a trasladar	moved_from_prefixedtext	cadena	(desaprobado) Usa moved_from_prefixedtitle en cambio.
Título completo de la página original a trasladar	moved_from_prefixedtitle	cadena
ID de la página original a trasladar	moved_from_articleid	número entero	(desaprobado) Usa moved_from_id en cambio.
ID de la página original a trasladar	moved_from_id	número entero
Antigüedad de la página original a trasladar (en segundos)	moved_from_age	número entero
Nivel de protección para la edición de la página origen del traslado	moved_from_restrictions_edit	array of string	Same as page_restrictions_edit, but for the page being moved.
Nivel de protección para el traslado de la página origen del traslado	moved_from_restrictions_move	array of string	Same as page_restrictions_move, but for the page being moved.
Nivel de protección para la subida del archivo origen del traslado	moved_from_restrictions_upload	array of string	Same as page_restrictions_upload, but for the page being moved.
Nivel de protección para la creación de la página origen del traslado	moved_from_restrictions_create	array of string	Same as page_restrictions_create, but for the page being moved.
Últimos diez usuarios en contribuir en la página original a trasladar	moved_from_recent_contributors	array of strings	Same as page_recent_contributors, but for the page being moved.
Primeros diez usuarios en contribuir en la página original a trasladar	moved_from_first_contributor	string	Same as page_first_contributor, but for the page being moved.
Nombre de usuario (en la creación de la cuenta)	accountname	cadena
Content model of the old revision	old_content_model	cadena	See Ayuda:ChangeContentModel for information about content model changes
Content model of the new revision	new_content_model	cadena	See Ayuda:ChangeContentModel for information about content model changes

Variables from other extensions

Most of these variables are always set to false when examinating past edits, and may not reflect their actual value at the time the edit was made. See T102944.

Descripción	Nombre	Tipo de dato	Valores	Added by
Grupos globales a los que pertenece el usuario	global_user_groups	array		Extensión:CentralAuth
Recuento global de ediciones de la cuenta	global_user_editcount	integer		Extensión:CentralAuth
Grupos globales en los que se encuentra el usuario (al crear la cuenta)	global_account_groups	array	Available only when action is 'createaccount' (then it is always empty) or 'autocreateaccount'.	Extensión:CentralAuth
Recuento global de ediciones del usuario (al crear la cuenta)	global_account_editcount	integer	Available only when action is 'createaccount' (then it is always zero) or 'autocreateaccount'.	Extensión:CentralAuth
El consumidor de OAuth solía realizar este cambio	oauth_consumer	integer		OAuth
Identificador de la página del tablero de Discusiones Estructuradas	board_articleid	número entero	(desaprobado) Usa board_id en cambio.	Extensión:StructuredDiscussions
Identificador de la página del tablero de Discusiones Estructuradas	board_id	número entero		Extensión:StructuredDiscussions
Espacio de nombres del panel de Discusiones estructuradas	board_namespace	número entero	refers to namespace index	Extensión:StructuredDiscussions
Título (sin el espacio de nombres) del panel de Discusiones estructuradas	board_text	cadena	(desaprobado) Usa board_title en cambio.	Extensión:StructuredDiscussions
Título (sin el espacio de nombres) del panel de Discusiones estructuradas	board_title	cadena		Extensión:StructuredDiscussions
Título completo del panel de Discusiones estructuradas	board_prefixedtext	cadena	(desaprobado) Usa board_prefixedtitle en cambio.	Extensión:StructuredDiscussions
Título completo del panel de Discusiones estructuradas	board_prefixedtitle	cadena		Extensión:StructuredDiscussions
Texto de origen de la unidad de traducción	translate_source_text	cadena		Extensión:Traducir
Target language for translation	translate_target_language	string	This is the language code, like en for English.	Extensión:Traducir
Si el cambio fue hecho o no a través de un nodo de salida tor	tor_exit_node	booleano	true if the action comes from a tor exit node.	TorBlock
Si un usuario está editando a través de la interfaz móvil	user_mobile	booleano	true for mobile users, false otherwise.	Extensión:MobileFrontend
Si un usuario está editando a través de la aplicación para móvil	user_app	booleano	true if the user is editing from the mobile app, false otherwise.	Extensión:MobileApp
Page views[1]	article_views	número entero	(desaprobado) Usa page_views en cambio.	HitCounters
Page views[2]	page_views	número entero	the amount of page views	HitCounters
Source page views[3]	moved_from_views	número entero	the amount of page views of the source page	HitCounters
Target page views[4]	moved_to_views	número entero	the amount of page views of the target page	HitCounters
Whether the IP address is blocked using the stopforumspam.com list[5]	sfs_blocked	booleano	Whether the IP address is blocked using the stopforumspam.com list	StopForumSpam

Apuntes

When action='move', only the summary, action, timestamp and user_* variables are available. The page_* variables are also available, but the prefix is replaced by moved_from_ and moved_to_, that represent the values of the original article name and the destination one, respectively. For example, moved_from_title and moved_to_title instead of page_title.

Since MediaWiki 1.28 (gerrit:295254), action='upload' is only used when publishing an upload, and not for uploads to stash. A new action='stashupload' is introduced, which is used for all uploads, including uploads to stash. This behaves like action='upload' used to, and only provides file metadata variables (file_*). Variables related to the page edit, including summary, new_wikitext and several others, are now available for action='upload'. For every file upload, filters may be called with action='stashupload' (for uploads to stash), and are always called with action='upload'; they are not called with action='edit'.

Filter authors should use action='stashupload' | action='upload' in filter code when a file can be checked based only on the file contents – for example, to reject low-resolution files – and action='upload' only when the wikitext parts of the edit need to be examined too – for example, to reject files with no description. This allows tools that separate uploading the file and publishing the file (e.g. UploadWizard or upload dialog) to inform the user of the failure before they spend the time filling in the upload details.

Performance

As noted in the table above, some of these variables can be very slow. While writing filters, remember that the condition limit is not a good metric of how heavy filters are. For instance, variables like *_recent_contributors or *_links always need a DB query to be computed, while *_pst variables will have to perform parsing of the text, which again is a heavy operation; all these variables should be used very, very carefully. For instance, on Italian Wikipedia it's been observed that, with 135 active filters and an average of 450 used conditions, filters execution time was around 500ms, with peaks reaching 15 seconds. Removing the added_links variable from a single filter, and halving the cases when another filter would use added_lines_pst brought the average execution time to 50ms. More specifically:

• Use _links variables when you need high accuracy and checking for "http://..." in other variables (for instance, added_lines) could lead to heavy malfunctioning;

• Use _pst variables when you're really sure that non-PST variables aren't enough.

You may also conditionally decide which one to check: if, for instance, you want to examine a signature, check first if added_lines contains ~~~;

• In general, when dealing with these variables, it's always much better to consume further conditions but avoid computing heavy stuff.

In order to achieve this, always put heavy variables as last conditions.

Last but not least, note that whenever a variable is computed for a given filter, it'll be saved and any other filter will immediately retrieve it. This means that one single filter computing this variable counts more or less as dozens of filters using it.

Keywords

Where not specifically stated, keywords cast their operands to strings

The following special keywords are included for often-used functionality:

• like (or matches) returns true if the left-hand operand matches the glob pattern in the right-hand operand.
• in returns true if the right-hand operand (a string) contains the left-hand operand. Nota: empty strings are not contained in, nor contain, any other string (not even the empty string itself).
• contains works like in, but with the left and right-hand operands switched. Nota: empty strings are not contained in, nor contain, any other string (not even the empty string itself).
• rlike (or regex) and irlike return true if the left-hand operand matches (contains) the regex pattern in the right-hand operand (irlike is case insensitive).
  • The system uses PCRE.
  • The only PCRE option enabled is PCRE_UTF8 (modifier u in PHP); for irlike both PCRE_CASELESS and PCRE_UTF8 are enabled (modifier iu).
• if ... then ... end
• if ... then ... else ... end
• ... ? ... : ...
• true, false, null

Ejemplos

Código	Resultado	Comentario
"1234" like "12?4"	True
"1234" like "12*"	True
"foo" in "foobar"	True
"foobar" contains "foo"	True
"o" in ["foo", "bar"]	True	Due to the string cast
"foo" regex "\w+"	True
"a\b" regex "a\\\\b"	True	To look for the escape character backslash using regex you need to use either four backslashes or two \x5C. (Either works fine.)
"a\b" regex "a\x5C\x5Cb"	True

Funciones

A number of built-in functions are included to ease some common issues. They are executed in the general format functionName( arg1, arg2, arg3 ), and can be used in place of any literal or variable. Its arguments can be given as literals, variables, or even other functions.

Nombre	Descripción
lcase	Returns the argument converted to lower case.
ucase	Returns the argument converted to upper case.
length	Returns the length of the string given as the argument. If the argument is an array, returns its number of elements.
string	Casts to string data type. If the argument is an array, implodes it with linebreaks.
int	Casts to integer data type.
float	Casts to floating-point data type.
bool	Casts to boolean data type.
norm	Equivalent to rmwhitespace(rmspecials(rmdoubles(ccnorm(arg1)))).
ccnorm	Normalises confusable/similar characters in the argument, and returns a canonical form. A list of characters and their replacements can be found on git, e.g. ccnorm( "Eeèéëēĕėęě3ƐƷ" ) === "EEEEEEEEEEEEE". The output of this function is always uppercase. While not expensive, this function isn't cheap either, and could slow a filter down if called many times.
ccnorm_contains_any	Normalises confusable/similar characters in all its arguments, and returns true if the first string contains any string from the following arguments (unlimited number of arguments, logic OR mode). A list of characters and their replacements can be found on git. Due to the usage of ccnorm, this function can be slow if passed too many arguments.
ccnorm_contains_all	Normalises confusable/similar characters in all its arguments, and returns true if the first string contains every string from the following arguments (unlimited number of arguments, logic AND mode). A list of characters and their replacements can be found on git. Due to the usage of ccnorm, this function can be slow if passed too many arguments.
specialratio	Returns the number of non-alphanumeric characters divided by the total number of characters in the argument.
rmspecials	Removes any special characters in the argument, and returns the result. Does not remove whitespace. (Equivalent to s/[^\p{L}\p{N}\s]//g.)
rmdoubles	Removes repeated characters in the argument, and returns the result.
rmwhitespace	Removes whitespace (spaces, tabs, newlines).
count	Returns the number of times the needle (first string) appears in the haystack (second string). If only one argument is given, splits it by commas and returns the number of segments.
rcount	Similar to count but the needle uses a regular expression instead. Can be made case-insensitive by letting the regular expression start with "(?i)". Please note that, for plain strings, this function can be up to 50 times slower than count, so use that one when possible.
get_matches	MW 1.31+ Looks for matches of the regex needle (first string) in the haystack (second string). Returns an array where the 0 element is the whole match and every [n] element is the match of the n'th capturing group of the needle. Can be made case-insensitive by letting the regular expression start with "(?i)". If a capturing group didn't match, that array position will take value of false.
ip_in_range	Returns true if user's IP (first string) matches the specified IP range (second string, can be in CIDR notation, explicit notation like "1.1.1.1-2.2.2.2", or a single IP). Only works for anonymous users. Supports both IPv4 and IPv6 addresses.
ip_in_ranges	Returns true if user's IP (first string) matches any of the specified IP ranges (following strings in logic OR mode, can be in CIDR notation, explicit notation like "1.1.1.1-2.2.2.2", or a single IP). Only works for anonymous users. Supports both IPv4 and IPv6 addresses.
contains_any	Returns true if the first string contains any string from the following arguments (unlimited number of arguments in logic OR mode). If the first argument is an array, it gets casted to string.
contains_all	Returns true if the first string contains every string from the following arguments (unlimited number of arguments in logic AND mode). If the first argument is an array, it gets casted to string.
equals_to_any	Returns true if the first argument is identical (===) to any of the following ones (unlimited number of arguments). Basically, equals_to_any(a, b, c) is the same as a===b | a===c, but more compact and saves conditions.
substr	Returns the portion of the first string, by offset from the second argument (starts at 0) and maximum length from the third argument (optional).
strlen	Same as length.
strpos	Returns the numeric position of the first occurrence of needle (second string) in the haystack (first string), starting from offset from the third argument (optional, default is 0). This function may return 0 when the needle is found at the beginning of the haystack, so it might be misinterpreted as false value by another comparative operator. The better way is to use === or !== for testing whether it is found. Differently from PHP's strpos(), which returns false when the needle is not found, this function returns -1 when the needle is not found.
str_replace	Replaces all occurrences of the search string with the replacement string. The function takes 3 arguments in the following order: text to perform the search on, text to find, replacement text.
str_replace_regexp	Replaces all occurrences of the search string with the replacement string using regular expressions. The function takes 3 arguments in the following order: text to perform the search on, regular expression to match, replacement expression.
rescape	Returns the argument with some characters preceded with the escape character "\", so that the string can be used in a regular expression without those characters having a special meaning.
set	Sets a variable (first string) with a given value (second argument) for further use in the filter. Another syntax: name := value.
set_var	Same as set.

Ejemplos

Código	Resultado	Comentario
length( "Wikipedia" )	9
lcase( "WikiPedia" )	wikipedia
ccnorm( "w1k1p3d14" )	WIKIPEDIA	ccnorm output is always uppercase
ccnorm( "ωɨƙɩᑭƐƉ1α" )	WIKIPEDIA
ccnorm_contains_any( "w1k1p3d14", "wiKiP3D1A", "foo", "bar" )	true
ccnorm_contains_any( "w1k1p3d14", "foo", "bar", "baz" )	false
ccnorm_contains_any( "w1k1p3d14 is 4w3s0me", "bar", "baz", "some" )	true
ccnorm( "ìíîïĩїį!ľ₤ĺľḷĿ" )	IIIIIII!LLLLLL
norm( "!!ω..ɨ..ƙ..ɩ..ᑭᑭ..Ɛ.Ɖ@@1%%α!!" )	WIKIPEDAIA
norm( "F00 B@rr" )	FOBAR	norm removes whitespace, special characters and duplicates, then uses ccnorm
rmdoubles( "foobybboo" )	fobybo
specialratio( "Wikipedia!" )	0.1
count( "foo", "foofooboofoo" )	3
count( "foo,bar,baz" )	3
rmspecials( "FOOBAR!!1" )	FOOBAR1
rescape( "abc* (def)" )	abc\* \(def\)
str_replace( "foobarbaz", "bar", "-" )	foo-baz
str_replace_regexp( "foobarbaz", "(.)a(.)", "$2a$1" )	foorabzab
ip_in_range( "127.0.10.0", "127.0.0.0/12" )	true
ip_in_ranges( "127.0.10.0", "10.0.0.0/8", "127.0.0.0/12" )	true
contains_any( "foobar", "x", "y", "f" )	true
get_matches( "(foo?ba+r) is (so+ good)", "fobaaar is soooo good to eat" )	['fobaaar is soooo good', 'fobaaar', 'soooo good']

Order of operations

Operations are generally done left-to-right, but there is an order to which they are resolved. As soon as the filter fails one of the conditions, it will stop checking the rest of them (due to short-circuit evaluation) and move on to the next filter. The evaluation order is:

1. Anything surrounded by parentheses (( and )) is evaluated as a single unit.
2. Turning variables/literals into their respective data. (e.g., page_namespace to 0)
3. Function calls (norm, lcase, etc.)
4. Unary + and - (defining positive or negative value, e.g. -1234, +1234)
5. Keywords (in, rlike, etc.)
6. Boolean inversion (!x)
7. Exponentiation (2**3 → 8)
8. Multiplication-related (multiplication, division, modulo)
9. Addition and subtraction (3-2 → 1)
10. Comparisons (<, >, ==)
11. Boolean operations (&, |, ^)
12. Ternary operator (... ? ... : ...)
13. Assignments (:=)

Ejemplos

• A & B | C is equivalent to (A & B) | C, not to A & (B | C). In particular, both false & true | true and false & false | true evaluates to true.
• A | B & C is equivalent to (A | B) & C, not to A | (B & C). In particular, both true | true & false and true | false & false evaluates to false.
• added_lines rlike "foo" + "|bar" is wrong, use added_lines rlike ("foo" + "|bar") instead.

Condition counting

The condition limit is (more or less) tracking the number of comparison operators + number of function calls entered.

Further explanation on how to reduce conditions used can be found at Extension:AbuseFilter/Conditions .

Exclusiones

Aunque la función del AbuseFilter identificará las acciones "rollback" como "edit", el AbuseFilter no evaluará las acciones para la coincidencia.

Enlaces útiles

• PCRE pattern syntax
• Edit filters of cross-wiki interest
• Extension:AbuseFilter/Conditions