TextReplace is a WiX extension that allows you to do regular expression find and replace on text files during an install I built it because I had a particular need for something similar, and I had need of a new side project to keep me amused during the long commute to work.

The code is licensed under the MIT License. See license.txt for details.

The component was designed to be build in VS2015. It may build in earlier versions, but this hasn't been tested. It will build in VS2015 Community. Note you will require both C# and C++ libraries installed in order to build it - the extension is written in C#, but the custom action it's built on is written in C++. It just a case of loading the solution and hitting "build".

The solution will build in VS2017 Community as well, although you will need to upgrade the projects on loading for the first time.

The built extension is under the TextReplace\bin folder. You only need the TextReplace.dll.

To use text replace, you need to do two things:

1. Add the namespace http://schemas.rottedfrog.co.uk/wix/TextReplace to your WixElement:
2. Add TextReplace elements to the components you want to associate the change to.

The TextReplace element has 3 attributes:

The Match and Replace expressions use ECMAScript syntax for regexes and replacement strings. For more information go to https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions

Note that both expressions can be read either as formatted strings or non-formatted strings. They are by default not formatted. If you add the special prefix [@@], then the expression will be read as a formatted string and you can include property values. Note that for Match, you will need to escape square brackets and braces if you make it formatted.

<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:tx="http://schemas.rottedfrog.co.uk/wix/TextReplace">
	<Fragment>
		<DirectoryRef Id="INSTALLFOLDER">
      <Component Id="Comp1">
        <File Id="testfile" Source="Testfile.txt" />
        <tx:TextReplace Id="text1" File="[#testfile]" Match="Hello " Replace="$&amp;$&amp;" />
      </Component>
		</DirectoryRef>
	</Fragment>
</Wix>

This will replace the string 'Hello World' in the test file with 'Hello Hello World'.