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<?php $pattern="\( ( (?>[^()]+) | (?R) )* \)"; $str="(def a (x) (+ 1 x))(print (a 1))"; var_dump(preg_match_all ($pattern,$str));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: preg_match_all(): Delimiter must not be alphanumeric, backslash, or NUL in /in/g3TmF on line 9 bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: preg_match_all(): Delimiter must not be alphanumeric or backslash in /in/g3TmF on line 9 bool(false)
Output for 4.3.4 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Warning: preg_match_all() expects at least 3 parameters, 2 given in /in/g3TmF on line 9 bool(false)
Output for 4.3.3
Warning: Delimiter must not be alphanumeric or backslash in /in/g3TmF on line 9 bool(false)
Output for 4.3.0 - 4.3.2
Warning: Wrong parameter count for preg_match_all() in /in/g3TmF on line 9 NULL
preferences:
299.33 ms | 401 KiB | 460 Q