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@ 2020-12-06T10:36:12Z

<?php

$pattern = '/^.*\bimportant\h+\d.*\R*/mi';
$string = 'important 1
some words ......
IMPORTANT 34
some words ......
important 99
some words ......';

$result = preg_replace($pattern, '', $string);

echo $result;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

32.46 ms | 404 KiB | 5 Q