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<?php $exprs = [ '/[=foo=]/', '/[:foo:]/', '/[.foo.]/', ]; foreach ($exprs as $expr) { echo $expr; preg_match($expr, 'foo'); }
Output for git.master, git.master_jit, rfc.property-hooks
/[=foo=]/ Warning: preg_match(): Compilation failed: POSIX collating elements are not supported at offset 0 in /in/5oVpP on line 11 /[:foo:]/ Warning: preg_match(): Compilation failed: POSIX named classes are supported only within a class at offset 0 in /in/5oVpP on line 11 /[.foo.]/ Warning: preg_match(): Compilation failed: POSIX collating elements are not supported at offset 0 in /in/5oVpP on line 11

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