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Saturday, 11 August 2018

IIS Rewrite Rules Regex

I'm not sure why it's so hard to find clear examples of the not-quite-regex regex that the IIS Url Rewrite module implements for its rewrite rules. Here are three things that I've wasted time figuring out.

1. Rewrite actions use regex matched groups by referencing {R:<group number>} eg. {R:1}

2. The order of the rules is critical, rewrites are then re-matched from scratch.

3. To prevent matches beginning with a word, use "^((?!theword).*)"

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