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@ 2021-12-09T08:14:51Z

<?php

preg_match('/(^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}(,{1}[\w-\.]+@([\w-]+\.)+[\w-]{2,4})*$)|^$/', "foo");

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preg_match: documentation ( source)

preferences:dark modelive preview

50.86 ms | 402 KiB | 5 Q