What about Mono? Looks like most of the people working on .NET are working out of Redmond at Microsoft.

re-builder in Emacs works really good for this because I’ll usually have the text in a buffer already that I want to match or replace or adjust or select - I’m constantly using it.

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I’m interested in finding ways to use it but when if I’m writing code I really like the spectrum of different answers on stack overflow with comment’s on WHY they did it that way. Might use it for boring emails though.