Thread:Project:Support desk/MediaWiki v1.19.1 installation: Compilation failed: support for \P, \p, and \X has not been compiled/reply (4)

v1.16.5 installs with no complaints or errors in regards to this issue, nor does it seem to show any misbehavior while running in my brief testing.

v1.19.1 fails to install, but fails very ungracefully. A simple check during the compatibility check phase of the installer would catch the problem:

if (!@preg_match('/\pL/', 'test')) { $PCREfail = true; }

or if you want to use a shell call: if (!preg_match('/^ *Unicode properties support *$/im', `pcretest -C`)) { $PCREfail = true; }