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<?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 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
8string(8) "one\"two" Warning: preg_match_all(): Compilation failed: unmatched closing parenthesis at offset 19 in /in/tkVsN on line 7 NULL
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 8string(8) "one\"two" Warning: preg_match_all(): Compilation failed: unmatched closing parenthesis at offset 19 in /in/tkVsN on line 7 NULL
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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/tkVsN on line 7 NULL

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