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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match("{(?'foo'\\d{0,99})}si", 'foo bar 42 lol', $m), $m);
based on rJpZr
Output for 4.4.6 - 4.4.9, 5.2.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(3) { [0]=> string(0) "" ["foo"]=> string(0) "" [1]=> string(0) "" }
Output for 5.2.0 - 5.2.1
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 2 in /in/gtNSh on line 2 bool(false) NULL
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: unrecognized character after (? at offset 2 in /in/gtNSh on line 2 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 2 in /in/gtNSh on line 2 bool(false) array(0) { }