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<?php $exprs = [ '/[=foo=]/', '/[:foo:]/', '/[.foo.]/', ]; foreach ($exprs as $expr) { echo $expr; preg_match($expr, 'foo'); }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
/[=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
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/5oVpP on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/5oVpP on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/5oVpP on line 3
Process exited with code 255.

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