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@ 2014-08-05T10:30:38Z

<?php

// your code goes here
$test = "moind3re pro_blème";
 
//if (preg_match("/^[a-zA-Z\x00C0-\x017F]/u", $test, $matches))
var_dump (filter_var($test, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_STRIP_LOW));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
filter_var: documentation ( source)

preferences:dark modelive preview

41.2 ms | 402 KiB | 5 Q