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run code in 200+ php & hhvm versions
Bugs & Features
<?php $date = "4/23/15"; echo $s = '~^' . implode('|', range(1, 12)) . '\/' . implode('|', range(1, 31)) . '\/[0-9]{2}$~'; preg_match($x, $date, $m); var_dump($m);
based on n0SPd
Output for 5.2.0 - 7.2.0
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ Notice: Undefined variable: x in /in/5o1q9 on line 5 Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 NULL
Output for 5.0.4 - 5.1.6
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ Notice: Undefined variable: x in /in/5o1q9 on line 5 Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 array(0) { }
Output for 4.3.11 - 5.0.3
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ Notice: Undefined variable: x in /in/5o1q9 on line 5 Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 array(0) { }
Output for 4.3.0 - 4.3.10
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ Notice: Undefined variable: x in /in/5o1q9 on line 5 Warning: Empty regular expression in /in/5o1q9 on line 5 array(0) { }