3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('/(*UTF8)(?<=\b)рус(?:\b)/uis', 'рус'));
Output for 5.3.4 - 7.1.0
int(1)
Output for 5.2.10 - 5.3.3
int(0)
Output for 4.4.9, 5.2.5 - 5.2.9
Warning: preg_match(): Compilation failed: (*VERB) not recognized at offset 5 in /in/rsvYF on line 2 bool(false)
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.2.4
Warning: preg_match(): Compilation failed: nothing to repeat at offset 1 in /in/rsvYF on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 1 in /in/rsvYF on line 2 bool(false)