requesting code to validate filename with regular expressions

[MrPolite]

it's pretty simple if you know regular expressions, so please help me out
I want an expression to validate if a filename is correct or not. The filename should not contain any of these characters: \ / : * ? " < > |

I would really appreciate this I dont know how to work with regular expressions myself. I know I can do it without regex but still would be better this way

[nemaroller]

Best place in the world for RegEx's

http://regexlib.com/Search.aspx?k=filename

2nd one down looks good..

[MrPolite]

whoa cool, thank
one q: that's the "matches" and "non-matches" thing? are those just examples?

[Pirate]

Originally posted by MrPolite
one q: that's the "matches" and "non-matches" thing? are those just examples?

Yes.

[nemaroller]

The matches and non-matches are the results of using testing the regex against whatever you put in the input field.

It allows you test the RegEx for common things to be certain it does what is has been advertised to do, and also allows you to change the regex real-time and keep retesting it.

Also be sure to test the RegEx with .Net and Javascript by selecting the appropriate radiobutton.

[wossname]

I just made this up off top of my head...

"^[^\\<>|\""\?\*]+(\.[^\\<>|\""\?\*]{1,3})?$"

Matches hello.txt but not hel\lo.txt.

Haven't tested it further than that though.

The above is a VB qualified string, I had to double up on the quote characters to make it work the real Regex string (in memory) should look like this...

"^[^\\<>|\"\?\*]+(\.[^\\<>|\"\?\*]{1,3})?$"