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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