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@ 2015-10-03T10:40:19Z

<?php
$text = "abc9def";
$pattern = '/[^a-zA-Z]/';

if (preg_match($pattern, $text)){
    print("no");
}else{
    print("yes");
}

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

40.82 ms | 402 KiB | 5 Q