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<?php echo preg_match_all('/[A-Za-z:_#xC0-#xD6#xD8-#xF6#xF8-#x2FF#x370-#x37D#x37F-#x1FFF#x200C-#x200D#x2070-#x218F#x2C00-#x2FEF#x3001-#xD7FF#xF900-#xFDCF#xFDF0-#xFFFD#x10000-#xEFFFF]/', 'test', $matches); var_dump($matches);
Output for 5.2.0 - 7.1.0
Warning: preg_match_all(): Compilation failed: range out of order in character class at offset 14 in /in/ctYqQ on line 2 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match_all(): Compilation failed: range out of order in character class at offset 14 in /in/ctYqQ on line 2 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: range out of order in character class at offset 14 in /in/ctYqQ on line 2 array(0) { }