3v4l.org

run code in 150+ php & hhvm versions
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<?php var_dump(preg_match("/(?P<foo>\\d{0,2})/si", 'foo bar 439689 lol', $m), $m);
based on Usj4K
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(1) array(3) { [0]=> string(0) "" ["foo"]=> string(0) "" [1]=> string(0) "" }
Output for 4.3.0 - 4.3.2
int(1) array(2) { [0]=> string(0) "" [1]=> string(0) "" }