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@ 2021-11-30T02:06:05Z

<?php

$re = '/{Delta=(\[[^][,]*,[^][]*])[^{}]*}/';
$str = '{Delta=[r3, r4], X=alarmOff, Y=heatOn}';

preg_match($re, $str, $matches);

print_r($matches[1]);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

108.74 ms | 1419 KiB | 5 Q