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@ 2014-09-03T21:39:19Z

<?php
$allowed_chars = 'a\-z 0\-9~%\.\:_\-';
$str = 'renewal';
if ( ! preg_match("/^[".preg_quote($allowed_chars)."]+$/i", $str)){
	echo "Unallowed!!!!";
}else{
	echo "Looks fine";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
preg_quote: documentation ( source)

preferences:dark modelive preview

45.95 ms | 402 KiB | 5 Q