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@ 2021-11-30T15:39:02Z

<?php

$re = '/{Delta=\[([^][,]*),\h*([^][]*)][^{}]*}/';
$str = '{Delta=[r3, r4], X=alarmOff, Y=heatOn}';
$result = preg_replace($re, '$1$2', $str);

echo $result;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

106.48 ms | 404 KiB | 5 Q