3v4l.org

run code in 300+ PHP versions simultaneously
<?php $txt = <<<TXT jkDDDJJJJjjjjJJlk jhlkj_sdHHhhHhhHHHHHHH kjhlkjh_JJJjjkkkkIIIIiiii TXT; echo preg_replace('/(.)(.*)/', "\u\\1\L\\2\E", $txt);
Output for git.master, git.master_jit, rfc.property-hooks
\uj\LkDDDJJJJjjjjJJlk\E \uj\Lhlkj_sdHHhhHhhHHHHHHH\E \uk\Ljhlkjh_JJJjjkkkkIIIIiiii\E

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