regex for filename validation 1

[hererxnl]

I've been looking everywhere for a regex to validate a filename. Obviously this would disallow:
\ / : * ? " < > |

Someone must have this in their arsenal. Thanks in advance.

 

[BabyJeffy]

Can you show us what you've managed so far? What resources have you already attempted? Have you visited the FAQ section here in Tektips?

Cheers,
Jeff

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What is Javascript? FAQ216-6094

 

[BillyRayPreachersSon]

You would also need to disallow certain specific filenames that can cause Windows boxes to hang / error, such as:

con,
lpt1 (... lptX)
prn

etc

Hope this helps,
Dan



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[kaht]

I'm not sure what the *exact* rules on filenames are anymore. Windows filenames don't nearly have the restrictions that they used to. Anyway, here's a regexp that disallows all the characters that you listed - additionally it will not allow multiple periods in a row (is that even valid?). Additionally, it requires the filename to have at least one period in it - which I know is not necessary. If you want to take that check out you can change the character marked in red to a *

This should cover most of your bases:

<script type="text/javascript">

function blah(str) {
   if (/^[^\\\/\:\*\?\"\<\>\|\.]+(\.[^\\\/\:\*\?\"\<\>\|\.]+)[!]+[/!]$/.test(str)) {
      alert("valid file name");
   }
   else {
      alert("this file name is invalid");
   }
}

</script>

<input type="text" id="txt" />
<input type="button" value="click me" onclick="blah(document.getElementById('txt').value)" />

-kaht

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[hererxnl]

Thanks a bunch kaht, a star for your efforts.