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<?php $string = "[a,b] some text [b,a] and some more"; $c = 1; echo preg_replace('/\[([^,]+),([^]]+)\]/', $c ? '$1' : '$2', $string) . "\n"; $c = 0; echo preg_replace('/\[([^,]+),([^]]+)\]/', $c ? '$1' : '$2', $string) . "\n";
Output for 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
a some text b and some more b some text a and some more

preferences:
94.12 ms | 1748 KiB | 4 Q