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<?php $input = <<<INP value that I {want}, vs value "I do {NOT} want". Let's make it {nested {this {time}}} And yes, it's even "{bullet-{proof}}" :) INP; @preg_match_all('~(\').*?\1(*SKIP)(*FAIL)|\{(?:[^{}]|(?R))*\}~', $input, $m); print_r($m[1]); ?>
Output for 4.4.9, 5.2.5 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => [1] => [2] => [3] => )
Output for 5.2.0 - 5.2.4
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.1, 4.4.3 - 4.4.8, 5.0.0 - 5.0.5, 5.1.0 - 5.1.1, 5.1.3 - 5.1.6
Notice: Undefined offset: 1 in /in/uZCen on line 10
Output for 4.4.2, 5.1.2
Notice: Undefined offset: 1 in /in/uZCen on line 11

preferences:
266.34 ms | 401 KiB | 377 Q