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@ 2024-01-08T19:24:30Z

<?php

$text = "ABC01
ABC02
ABC03
ABC04
ABC05
ABC06
";

echo preg_replace(
         '/.+\K\R+(?=ABC04)/',
         ' - ',
         trim($text)
     );

Output
Performance
VLD
References
Branches

trim: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

26.65 ms | 405 KiB | 5 Q