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run code in 150+ php & hhvm versions
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<?php preg_match("@^\s*(?P<monthDay>([0-2]?[1-9]|[12]0|3[01]))\s+(?P<monthNameFull>p{L}+?)\s+(?P<‌yearFull>[12]\d{3})\s*$@i", "18 Février 2015", $matches); print_r($matches);
based on HnQlK
Output for 5.2.2 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: syntax error in subpattern name (missing terminator) at offset 78 in /in/OLOba on line 2
Output for hhvm-3.12.0
Warning: Compilation failed: syntax error in subpattern name (missing terminator) at offset 78 in /in/OLOba on line 2
Output for hhvm-3.10.0
Warning: Compilation failed: syntax error in subpattern name (missing terminator) at offset 78 in /in/OLOba on line 8
Output for 5.2.0 - 5.2.1
Warning: preg_match(): Compilation failed: syntax error after (?P at offset 78 in /in/OLOba on line 2
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: syntax error after (?P at offset 78 in /in/OLOba on line 2 Array ( )
Output for 4.4.6 - 4.4.9
Warning: preg_match(): Compilation failed: syntax error in subpattern name (missing terminator) at offset 78 in /in/OLOba on line 2 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: syntax error after (?P at offset 78 in /in/OLOba on line 2 Array ( )