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  1. <?php
  2.  
  3. $re = '~\B(?<!@)@([0-9a-z]+)(?:\s|$)~ui'; 
  4. $str = "@ww@ee  x@@vx @ss @aa assadd @sfsd"; 
  5. preg_match_all($re, $str, $matches);
  6. print_r($matches);
Success #stdin #stdout 0.02s 52432KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => Array
        (
            [0] => @ss 
            [1] => @aa 
            [2] => @sfsd
        )

    [1] => Array
        (
            [0] => ss
            [1] => aa
            [2] => sfsd
        )

)
https://ideone.com/jkgfCy
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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