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run code in 150+ php & hhvm versions
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<?php $str = "Foo *Bar\* asdf* Baz"; var_dump(preg_replace_callback('{\*([^\*]+)\*?}', function($matches) { var_dump($matches); return "<b>{$matches[1]}</b>"; }, $str));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(6) "*Bar\*" [1]=> string(4) "Bar\" } array(2) { [0]=> string(5) "* Baz" [1]=> string(4) " Baz" } string(31) "Foo <b>Bar\</b> asdf<b> Baz</b>"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/3719n on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/3719n on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/3719n on line 5
Process exited with code 255.