ColdFusion REGEX - to determine the file's extension -

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i'm looking regex obtain files extension.

given examples like:

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

i need regex provides 3-4 char extension, isn't fooled things like:

asdadsasdads.jpg.png

and gets png seen above.

i think listlast better job you:

<cfset fileext=listlast(yourfilename,".")>

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