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90

answers:

1
+1  Q: 

ColdFusion REGEX - to determine the file's extention

I'm looking for a REGEX to obtain a files extention.

Given examples like:

modocument.doc
modocument.docx
dasddsa.pdf
kdsksdklsadklasdklads.png
ads123.jpg

I need a REGEX that provides the 3-4 char extention, but isn't fooled by things like:

asdadsasdads.jpg.png

And only gets PNG as seen above. thxs

+12  A: 

I think ListLast would do a better job for you:

<cfset FileExt=ListLast(YourFilename,".")>
Gert G  2010-07-25 20:08:54
This will also be much faster than using a regex.
Ben Doom  2010-07-25 20:25:45
To expand on Ben's comment - regexes don't work backwards, so they have to scan the whole string, where as ListLast will start at the end and go back, only looking at a handful of chars.
Peter Boughton  2010-07-26 08:38:32
Be sure to keep in mind wether the file even has an extension.
Tyler Clendenin  2010-07-26 18:48:11

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