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<?php $str ="test Приходите в наш <a d>test</a> видеочат, бывший когда-то test'м.testa больше нет. Забейте на <h2>test</h3> Труконф test"; echo preg_replace('/<a[^>]*>test\K(*SKIP)(*FAIL)|test/', '<$0>', $str).PHP_EOL; echo preg_replace('/a{3}c/', '<$0>', 'aaaac');
Output for git.master, git.master_jit, rfc.property-hooks
<test> Приходите в наш <a d>test</a> видеочат, бывший когда-то <test>'м.<test>a больше нет. Забейте на <h2><test></h3> Труконф <test> a<aaac>

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