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@ 2017-11-21T16:55:33Z

<?php

$str = "Matt Person emailaddr@email.com
John doe doesoe@gmail
Matt Person emailaddr@email.com
Trump donald@whitehouse";

$find = "Matt Person emailaddr@email.com";

$arr=explode("\n", $str);

Foreach($arr as $key => &$line){

    If($line == $find){
        Unset($arr[$key]);
    }
}
Echo implode("\n", $arr);

Output
Performance
VLD
References
Branches

implode: documentation ( source)
explode: documentation ( source)

preferences:dark modelive previewkey bindings

27.84 ms | 405 KiB | 5 Q