This is a dangerous application to put on the web. You give the user an opportunity to run arbitrary code in (?{...}) or (??{...}) constructs in the regex. With the /e switch, arbitrary code can also be run in the replacement string.

After Compline,
Zaxo

In reply to Re: How to do regex backreferences within $variable replacement text? by Zaxo
in thread How to do regex backreferences within $variable replacement text? by ManFromNeptune

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