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run code in 150+ php & hhvm versions
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<?php print_r(preg_match("@^(?'day'\d+)\s+(?'month'\p{L}+?)\s+(?'year'\d+)$@m", "18 August 2015"));
based on dPDqo
Output for 4.4.6 - 4.4.9, 5.2.2 - 7.1.0
1
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.2.1
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 3 in /in/dGZVk on line 2
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 3 in /in/dGZVk on line 2