Extension:AbuseFilter/Rules format/es

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This page is a translated version of the page Extension:AbuseFilter/Rules format and the translation is 37% complete.

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The rules are formatted much as conditionals in a C/Java/Perl-like language.

Cadenas

You can specify a literal by placing it in single or double quotes (for strings), or by typing it in as-is (for numbers, both floating-point and integer). You can get linebreaks with \n, tab characters with \t, and you can also escape the quote character with a backslash.

Use the + (plus) symbol to concatenate two literal strings or the values of two vars with a string value.

Ejemplos
"This is a string"
'This is also a string'
'This string shouldn\'t fail'
"This string\nHas a linebreak"
1234
1.234
-123

User-defined variables

You can define custom variables for ease of understanding with the assign symbol := in a line (closed by ;) within a condition. Such variables may use letters, underscores, and numbers (apart from the first character) and are case sensitive. Example (from 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.

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 // Counts the elements
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 ]


Comments

You can specify comments using the following syntax:

/* Esto es un comentario */

Arithmetic

You can use basic arithmetic symbols to do arithmetic on variables and literals with the following syntax:

  • - — Subtract the right-hand operand from the left-hand operand.
  • + — Add the right-hand operand to the left-hand operand.
  • * — Multiply the left-hand operand by the right-hand operand.
  • / — Divide the left-hand operand by the right-hand operand.
  • ** — Raise the left-hand operand to the exponential power specified by the right-hand operand.
  • % — Return the remainder given when the left-hand operand is divided by the right-hand operand.

The type of the returned result is the same that would be returned by PHP, for which a lot of documentation may be found online. More exhaustive examples may be found in this AF parser test.

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

Boolean operations

You can match if and only if all of a number of conditions are true, one of a number of conditions are true, or one and only one of all conditions are true.

  • x | y — OR – returns true if one or more of the conditions is true.
  • x & y — AND – returns true if both of the conditions are true.
  • x ^ y — XOR – returns true if one, and only one of the two conditions is true.
  • !x — NOT – returns true if the condition is not true.

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

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[1]

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 from AbuseFilter

Variables always available

¡Atención! 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.
Descripción Nombre Tipo de dato Apuntes
Acción action cadena One of the following: edit, move, createaccount, autocreateaccount, delete, upload[2], stashupload[3]
Contador de ediciones del usuario user_editcount integer/null Null only for unregistered users.
Nombre de la cuenta de usuario user_name cadena
For "createaccount" action, use accountname if you want the name of the account being created.
El tiempo que hace que la dirección de correo electrónico fue confirmada user_emailconfirm cadena 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 esta 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. Null otherwise.
This doesn't differentiate between partial and total 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 (found in the page's HTML source - search for wgArticleId) page_id número entero In theory this is 0 for new pages, but this is unreliable. If you need an exact result, use "page_age == 0" to identify new page creation. (note that it is slower, though.)
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
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).[4] Try to put conditions more likely evaluate to false before this one, to avoid unnecessarily running the query.

Variables available for some actions

¡Atención! 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.
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.[5]
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.[6]
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.[7]
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
Enlaces en la página, antes de la edición old_links array of strings
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
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.
Unix timestamp of change timestamp cadena int(timestamp) gives you a number with which you can calculate the date, time, day of week, etc.
Hash SHA1 del contenido del archivo file_sha1 cadena [2]
Tamaño del archivo en bytes file_size número entero The file size in bytes[2]
Anchura del archivo en píxeles file_width número entero The width in pixels[2]
Altura del archivo en píxeles file_height número entero The height in pixels[2]
Bits por canal de color del archivo file_bits_per_channel número entero The amount of bits per color channel[2]
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 cadena
Antigüedad de página destino del traslado (en segundos) moved_to_age número entero
Espacio de nombres de la página original a trasladar moved_from_namespace cadena
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
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

Descripción Nombre Tipo de dato Valores Added by
Grupos globales a los que pertenece el usuario global_user_groups array CentralAuth
Identificador de la página del tablero de Discusiones Estructuradas board_articleid número entero (desaprobado) Usa board_id en cambio. StructuredDiscussions
Identificador de la página del tablero de Discusiones Estructuradas board_id número entero StructuredDiscussions
Espacio de nombres del panel de Discusiones estructuradas board_namespace número entero refers to namespace index StructuredDiscussions
Título (sin el espacio de nombres) del panel de Discusiones estructuradas board_text cadena (desaprobado) Usa board_title en cambio. StructuredDiscussions
Título (sin el espacio de nombres) del panel de Discusiones estructuradas board_title cadena StructuredDiscussions
Título completo del panel de Discusiones estructuradas board_prefixedtext cadena (desaprobado) Usa board_prefixedtitle en cambio. StructuredDiscussions
Título completo del panel de Discusiones estructuradas board_prefixedtitle cadena StructuredDiscussions
Texto de origen de la unidad de traducción translate_source_text cadena Extensión:Translate
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
⧼abusefilter-edit-builder-vars-user-wpzero⧽ user_wpzero booleano
This variable is only valid when filtering an action. When examining a past edit or batch testing, it'll always be null.
WikimediaEvents
⧼abusefilter-edit-builder-vars-page-views⧽ article_views número entero (desaprobado) Usa page_views en cambio. HitCounters
⧼abusefilter-edit-builder-vars-page-views⧽ page_views número entero the amount of page views HitCounters
⧼abusefilter-edit-builder-vars-movedfrom-views⧽ moved_from_views número entero the amount of page views of the source page HitCounters
⧼abusefilter-edit-builder-vars-movedto-views⧽ moved_to_views número entero the amount of page views of the target page HitCounters
⧼abusefilter-edit-builder-vars-is-proxy⧽ is_proxy número entero Whether this action was performed through a proxy AutoProxyBlock
⧼abusefilter-edit-builder-vars-sfs-blocked⧽ 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 (https://gerrit.wikimedia.org/r/#/c/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 will allow 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".[8] The output of this function is always uppercase.
ccnorm_contains_any Normalises confusable/similar characters in the 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.
ccnorm_contains_all Normalises confusable/similar characters in the 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.
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. (Equivalent to s/[^\p{L}\p{N}]//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 simple strings, this function is roughly ten 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, in CIDR notation). 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 begining 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.
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.
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
ip_in_range( "127.0.10.0", "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. (&, |, ^)

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.

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 .

Exclusions

Although the AbuseFilter examine function will identify "rollback" actions as edits, the AbuseFilter will not evaluate rollback actions for matching. [9]

Useful links

Apuntes

  1. Comparing arrays to other types will always return false, except for the example above
  2. 2.0 2.1 2.2 2.3 2.4 2.5 The only variables currently available for file uploads (action='upload') are user_*, page_*, file_sha1, file_size, file_mime, file_mediatype, file_width, file_height, file_bits_per_channel (the last five were only added since the release for MediaWiki 1.27 gerrit:281503). All the file_* variables are unavailable for other actions (including action='edit').
  3. Desde MediaWiki 1.28 (https://gerrit.wikimedia.org/r/#/c/295254/)
  4. Several filters (12) that use this variable have showed up in the AbuseFilterSlow Grafana dashboard (requires logstash access to view). Moving this variable to towards the end of the filter seemed to help.
  5. Véase phabricator:T191722.
  6. Deprecated with this commit and disabled with this one.
  7. Some filters using this variable have showed up in the AbuseFilterSlow Grafana dashboard (example, requires logstash access). For instance, instead of using "text" in edit_diff_pst (or even edit_diff), consider something like "text" in added_lines & !("text" in removed_lines)
  8. Be aware of phab:T27619. You can use Special:AbuseFilter/tools to evaluate ccnorm( "your string" ) to see which characters are transformed.
  9. T24713 - rollback not matched by AF