3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a\\\\,b,c\\,d'; print_r(preg_split('/(?<![^\\\\][\\\\]),/', $str)); print_r(preg_split('/(?<!(?<!\\\\)\\\\),/', $str)); print_r(preg_split('/(?<![^\\\\])(?<!\\\\),/', $str));
based on 1fcGp
Output for 4.4.5 - 4.4.9, 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => a\\ [1] => b [2] => c\,d ) Array ( [0] => a\\ [1] => b [2] => c\,d ) Array ( [0] => a\\,b,c\,d )
Output for 4.3.11 - 4.4.4, 5.0.0 - 5.1.6
Warning: preg_split(): Compilation failed: lookbehind assertion is not fixed length at offset 13 in /in/bZs7J on line 4 Array ( [0] => a\\ [1] => b [2] => c\,d ) Warning: preg_split(): Compilation failed: lookbehind assertion is not fixed length at offset 9 in /in/bZs7J on line 6
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 13 in /in/bZs7J on line 4 Array ( [0] => a\\ [1] => b [2] => c\,d ) Warning: Compilation failed: lookbehind assertion is not fixed length at offset 9 in /in/bZs7J on line 6