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<?php $folder = 'PhpStorm-138.940'; var_dump(preg_match('\138.940\g', $folder));
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/Xn34B on line 5 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/Xn34B on line 5 bool(false)