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<?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);
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
~^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}$~ Warning: Undefined variable $x in /in/5o1q9 on line 5 Deprecated: preg_match(): Passing null to parameter #1 ($pattern) of type string is deprecated in /in/5o1q9 on line 5 Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 NULL
Output for 8.0.0 - 8.0.30
~^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}$~ Warning: Undefined variable $x in /in/5o1q9 on line 5 Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 NULL
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ 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 7.3.32 - 7.3.33
~^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}$~ Warning: preg_match(): Empty regular expression in /in/5o1q9 on line 5 NULL
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6
~^1|2|3|4|5|6|7|8|9|10|11|12\/1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31\/[0-9]{2}$~ 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, 4.4.0 - 4.4.9, 5.0.0 - 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) { }

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