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<?php $quotedString = '"(?:[^"\\\\]*(?\\\\.(*SKIP)(*FAIL))?)*"'; $regex = "($quotedString)"; $string = 'This is "A test of the \"Emergency System\" here..."'; var_dump(preg_match($regex, $string, $match), $match);
Output for 5.2.6 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: preg_match(): Compilation failed: unrecognized character after (? or (?- at offset 13 in /in/YWYTm on line 8 bool(false) NULL
Output for 5.2.0 - 5.2.5
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 13 in /in/YWYTm on line 8 bool(false) NULL
Output for 4.3.11, 4.4.0 - 4.4.8, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 13 in /in/YWYTm on line 8 bool(false) array(0) { }
Output for 4.4.9
Warning: preg_match(): Compilation failed: unrecognized character after (? or (?- at offset 13 in /in/YWYTm on line 8 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 13 in /in/YWYTm on line 8 bool(false) array(0) { }

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