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This RE validates a path/file of type txt (text file) This RE can be used as a filter on certain file types, while insuring the entire string is a fully qualified path and file. The filter value can be changed or added to as you need

Matches a file name to be either a .wma or .mp3 file. This can be used to check file uploads to make sure they are of a certain type. Substitute letters where appropriate for specific file types. To include more simply add logical 'or' (|) operator and append.

Matches a file name to be either a .wma or .mp3 file. This can be used to check file uploads to make sure they are of a certain type. Substitute letters where appropriate for specific file types. This is a better solution (I think) than #343. Works in Javascript and C#.

I used this regex to check to make sure the file type being uploaded through an input tag was a zip file. Changing the '.zip' to another extension will change the file extension being verified.

Finds the last word in a string eg. the user in \\domain\user or the extension/file type in a file name.

Finds the last word in a string eg. the user in \\domain\user or the extension/file type in a file name.

You can use this to check the valid file type you have given to the last in the expression like ^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.pdf)$ This will accept .pdf only OR ^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+((.pdf)|(.doc))$ This will accept .pdf and .doc OR ^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+((.pdf)|(.doc)|(.txt))$ This will accept .pdf , .doc and .txt

This expression will only allow the .jpg and .gif file to get uploaded. This handles the case of the file type i.e. it will accept .gif and .GIF both and so on .JPG and .jpg.