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run code in 150+ php & hhvm versions
Bugs & Features
<?php $txt ='<!-- [newsletter:123123] --> <html style="font-size:14px;font:inherit;vertical-align:baseline;font-family:Open Sans,sans-serif;height:100%;"> <head><meta http-eq'; preg_match('\[newsletter:(\d*?)\]', $txt, $matches); var_dump($matches);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/rjbMF on line 6 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/rjbMF on line 6 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/rjbMF on line 6 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/rjbMF on line 6 array(0) { }