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@ 2017-09-21T14:09:55Z

<?php

    $string = '3:1,1:2,2:3';
    $string = preg_replace('#1:(\d*),#', 'whateverToReplaceWith', $string);
    echo $string;

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preg_replace: documentation ( source)

preferences:dark modelive preview

27.33 ms | 402 KiB | 5 Q