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<?php $query = "-exclude -\"exclude phrase\" \"phrase 1\" keyword +k:v -k2:v2 +\"q kw\":2"; $ATOM_REGEX = '("[^"]+"|[^"\s]+)'; $match = preg_match_all("/(-|+)($ATOM_REGEX:)?($ATOM_REGEX)/", $query); print_r($match);
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 3 in /in/Wn3Q8 on line 5
Output for 4.3.3, hhvm-3.12.0
Warning: Compilation failed: nothing to repeat at offset 3 in /in/Wn3Q8 on line 5
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.4 - 5.3.29
Warning: preg_match_all() expects at least 3 parameters, 2 given in /in/Wn3Q8 on line 5
Output for 4.3.0 - 4.3.2
Warning: Wrong parameter count for preg_match_all() in /in/Wn3Q8 on line 5