garethhunt/modifyheaders — pull request #1 by ptekchand (2012-03-27 19:21:05+00:00)
Title: Support for replacement based on a regular expression match.

If the _Header value_ for a _Modify_ action is of the form
{*RegEx*}{*replacement*}
_RegEx_ is a [Regular expression](https://developer.mozilla.org/en/JavaScript/Guide/Regular_Expressions)
_replacement_ is the string a matched header portion will be replaced with.

Perhaps some users may find this useful - to conditionally replace headers.

My master branch has changes which work replace the channel when the Host header is being modified, though I thought most users may not find that very useful.