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<?php
 
$re = '~[mwf]|th?|su?~'; 
$str = "mwftthssu"; 
preg_match_all($re, $str, $matches);
print_r($matches[0]);

Success #stdin #stdout 0.02s 52472KB

stdin

Standard input is empty

stdout

Array
(
    [0] => m
    [1] => w
    [2] => f
    [3] => t
    [4] => th
    [5] => s
    [6] => su
)

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language:

PHP (php 7.3.5)

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