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<?php preg_match_all("/(?J)(?|(?P<A>a)!|(?P<A>a)=(?P<type>[si])) (?|(?P<B>b)!|(?P<B>b)=(?P<type>[si]))/", "a! b=s a=i b!", $m, PREG_SET_ORDER); foreach ($m as $s) { foreach ($s as $k => $v) { if (is_int($k)) { unset($s[$k]); } } print_r($s); }
Output for 4.4.9, 5.2.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [A] => a [type] => s [B] => b ) Array ( [A] => a [type] => i [B] => b )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.3
Warning: preg_match_all(): Compilation failed: unrecognized character after (? at offset 6 in /in/5BAtc on line 2 Warning: Invalid argument supplied for foreach() in /in/5BAtc on line 4
Output for 4.3.11 - 4.4.4, 5.0.0 - 5.1.6
Warning: preg_match_all(): Compilation failed: unrecognized character after (? at offset 2 in /in/5BAtc on line 2
Output for 4.4.5 - 4.4.8
Warning: preg_match_all(): Compilation failed: unrecognized character after (? at offset 6 in /in/5BAtc on line 2
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (? at offset 2 in /in/5BAtc on line 2