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@ 2014-02-11T20:06:43Z

<?php

$string = "48";
if(preg_match("/[a-z][A-Z]/",$string)!==false) {
  echo "gots a letter";
}

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

37.51 ms | 402 KiB | 5 Q