3v4l.org

run code in 300+ PHP versions simultaneously
<?php $A='one\\"two'; echo strlen($A); var_dump($A); $Input= 'zero:("),one:(\\"),two:(\\\\"),three:(\\\\\\"),four:(\\\\\\\\"),five:(\\\\\\\\\\"),six:(\\\\\\\\\\\\")'; preg_match_all( "/[^\\]*((\\{2})*)(['\"])(.)*\1/U", $Input, $Matches); var_dump($Matches);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
8string(8) "one\"two" Warning: preg_match_all(): Compilation failed: unmatched closing parenthesis at offset 19 in /in/jmkg5 on line 7 NULL
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
8string(8) "one\"two" Warning: preg_match_all(): Compilation failed: unmatched parentheses at offset 19 in /in/jmkg5 on line 7 NULL

preferences:
209.2 ms | 402 KiB | 228 Q