<?php
$pattern="\( ( (?>[^()]+) | (?R) )* \)";
$str="(def a (x) (+ 1 x))(print (a 1))";
preg_match_all($pattern,$str,$out);
var_dump($out);
- 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/WRPKW on line 9
NULL
- Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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/WRPKW on line 9
NULL
- Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
- Warning: preg_match_all(): Delimiter must not be alphanumeric or backslash in /in/WRPKW on line 9
array(0) {
}
- Output for 4.3.0 - 4.3.10
- Warning: Delimiter must not be alphanumeric or backslash in /in/WRPKW on line 9
array(0) {
}
preferences:
271.18 ms | 401 KiB | 424 Q