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@ 2013-09-18T23:53:48Z

<?php

$subject = <<<EOL
1. first
2. second
3. third
EOL;

preg_match('/^.{1,20}?$/i', $subject, $matches);
var_dump($matches);
$subject = "qasd\nasdasd\nasda";
preg_match('/^.{1,20}?$/gim', $subject, $matches);
var_dump($matches);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

38.28 ms | 402 KiB | 5 Q