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<?php
$re = "/(?<=@)[^,]+/"; 
$str = "Hello @bob, my name is @jack,"; 
preg_match_all($re, $str, $matches);
print_r($matches);

Success #stdin #stdout 0.02s 24144KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => bob
            [1] => jack
        )

)

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language:

PHP (php 7.3.5)

created:

visibility:

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