<?php $str = '/some-folders/../pattern,also-replacement-area/parameter-one'; echo preg_replace('~(?:^.*?/pattern,)?(?!^)[^/-]*+\K-~A', '~', $str), PHP_EOL, preg_replace_callback('~/pattern,[^/]*~', fn($m) => strtr($m[0], '-', '~'), $str), // other way (more simple pattern) PHP_EOL;
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