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@ 2014-09-16T17:24:52Z

<?php

$string = 'Lorem ipsum dolor sit amet.';

$alphanumeric = preg_match('~^[\pL\pN]++$~iu', $string);

var_dump($alphanumeric);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

42.17 ms | 402 KiB | 5 Q