Google Search: find file extension with regex in c#

I have had a search to my page where I know the reader probably didn’t find what they were looking for.

This post is to hopefully let that user find the information that they are looking for better.

The Search term was “find file extension with regex in c#".

A simple regex that could be used in C# to find file extensions is:

.+.([^.]+)$

This will find an extension that is at the end of the string. To find an extension anywhere in a string you can use:

.+.([^.]+)\s

A regex to find a three letter extension at the end of a line:

.+.([^.]{3})$

To find a three letter extension anywhere in a string you can use:

.+.([^.]{3})\s

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Paul Kinlan

I lead the Chrome Developer Relations team at Google.

We want people to have the best experience possible on the web without having to install a native app or produce content in a walled garden.

Our team tries to make it easier for developers to build on the web by supporting every Chrome release, creating great content to support developers on web.dev, contributing to MDN, helping to improve browser compatibility, and some of the best developer tools like Lighthouse, Workbox, Squoosh to name just a few.

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