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Posted 24 Jun 2011

Regular Expression to Validate File Path and Extension

, 28 May 2012 CPOL
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Regular Expression to validate the file path and extension and it is compatible with JavaScript and ASP.NET


Recently, I was looking for a regular expression to validate a file path and extension. I found several of them on Google, but none of them fit my requirement. So I decided to put together a version that suits my need. Here is the Regular Expression to validate the file path and extension and it is compatible with JavaScript and ASP.NET. I hope someone will find this information useful and that it will make your programming job easier.



^(?:[\w]\:|\\) -- Begin with x:\ or \\
[a-z_\-\s0-9\.] -- valid characters are a-z| 0-9|-|.|_ (you can add more)
(txt|gif|pdf|doc|docx|xls|xlsx) -- Valid extension (you can add more)


\\\my folder\folder.2\file.gif
c:\my folder\abc abc.docx


\\\my folder\folder.2\.gif
c:\my folder\another_folder\.docx
c:\my folder\\another_folder\abc.docx
c:\my folder\another_folder\ab*c.v2.docx

Test It


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Bryian Tan
Software Developer (Senior)
United States United States
I have over 10 years of experience working with Microsoft technologies. I have earned my Microsoft Certified Technology Specialist (MCTS) certification. I'm a highly motivated self-starter with an aptitude for learning new skills quickly.

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Comments and Discussions

Questionunicode not supported Pin
Member 1251722311-May-16 3:46
memberMember 1251722311-May-16 3:46 
PraiseWorked for me Pin
Member 773674116-Feb-16 12:07
memberMember 773674116-Feb-16 12:07 
QuestionThanks Pin
G. Landry8-Jan-16 2:04
memberG. Landry8-Jan-16 2:04 
SuggestionFile extensions order Pin
Sergei Vedischev19-Jun-14 6:06
memberSergei Vedischev19-Jun-14 6:06 
GeneralRe: File extensions order Pin
Bryian Tan30-Jul-14 4:36
memberBryian Tan30-Jul-14 4:36 
QuestionMore complete version Pin
DeepBlackHole11-Mar-13 17:45
memberDeepBlackHole11-Mar-13 17:45 
GeneralRe: More complete version Pin
Bryian Tan12-Mar-13 12:57
memberBryian Tan12-Mar-13 12:57 
QuestionHi Pin
Rogério F Moreira10-Aug-12 5:10
memberRogério F Moreira10-Aug-12 5:10 
AnswerRe: Hi Pin
Bryian Tan10-Aug-12 16:53
memberBryian Tan10-Aug-12 16:53 
QuestionMac and Linux? Pin
Menelaos Vergis28-May-12 23:15
memberMenelaos Vergis28-May-12 23:15 
GeneralRe: Mac and Linux? Pin
Bryian Tan29-May-12 5:21
memberBryian Tan29-May-12 5:21 
Questionhi Pin
beleshi28-May-12 21:28
memberbeleshi28-May-12 21:28 
SuggestionDid not work!! Pin
klnreddy26-Mar-12 8:27
memberklnreddy26-Mar-12 8:27 
GeneralRe: Did not work!! Pin
Bryian Tan26-Mar-12 16:21
memberBryian Tan26-Mar-12 16:21 
GeneralRe: Did not work!! Pin
gchq26-May-12 8:30
membergchq26-May-12 8:30 
GeneralRe: Did not work!! Pin
Bryian Tan28-May-12 16:40
memberBryian Tan28-May-12 16:40 

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