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@ 2014-01-27T15:04:35Z

<?php

$string = "{download='text for button'} HAHA! {download='test'}";

preg_match_all("/{download='(.*?)'}/", $string, $matches, PREG_SET_ORDER);

foreach ($matches as $val) {
    $string = str_replace("{download='" . $val[1] . "'}", "<a class=\"button\">" . $val[1] . "</a>",  $string);
}

echo $string;

Output
Performance
VLD
References
Branches

preg_match_all: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

44.78 ms | 402 KiB | 5 Q