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@ 2014-09-05T08:06:22Z

<?php

$text   = "Php: A programming language";
$result = preg_replace_callback('/^([^a-zA-Z]*)([A-Za-z])/', function($m)
{
   return $m[1].strtoupper($m[2]);
}, $text);

echo $result;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
strtoupper: documentation ( source)

preferences:dark modelive preview

46.04 ms | 402 KiB | 5 Q