How to remove `//<![CDATA[` and end `//]]>`?

You don't need regex for a static string.

Replace those parts of the texts with nothing:

$string = str_replace("//<![CDATA[","",$string);
$string = str_replace("//]]>","",$string);

The following regex will do it...

$removed = preg_replace('/^\s*\/\/<!\[CDATA\[([\s\S]*)\/\/\]\]>\s*\z/', 
                        '$1', 
                        $scriptText);

CodePad.

If you must...

$s = preg_replace('~//<!\[CDATA\[\s*|\s*//\]\]>~', '', $s);

This will remove the whole line containing each tag without messing up the indentation of the enclosed code.

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