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<?php $matches = []; $reg = '/(?:^|(?:\s*\,\s*))([^\x00-\x20\(\)<>@\,;\:"\/\[\]\?\=\{\}\x7F]+)(?:\=(?:([^\x00-\x20\(\)<>@\,;\:"\/\[\]\?\=\{\}\x7F]+)|(?:"((?:[^"\]|\.)*)")))?/'; preg_match_all($reg, 'User-Agent, Accept', $matches, PREG_SET_ORDER); var_dump($matches); echo 'aaa'; var_dump('bb');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match_all(): Compilation failed: missing terminating ] for character class at offset 143 in /in/mfS2i on line 5 array(0) { } aaastring(2) "bb"

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