regexp not working

trying to strip strings out of a http request using a regexp:

I'm querying a server as to the presence of PDF files in a directory, then parsing a list from the rawhtml, unfortunately, some of the files contain periods and commas, and the Regexp only matches a string from after the punctuation character,

e.g.: "John M. Smith.pdf" gets matched as "Smith.pdf"

Here's the Regexp:

<cffunction name="parsePDF" access="public" returntype="string">
        <cfargument name="RAWHTML" type="string" required="yes">
        <cfset REGEXPMATCH="^[\s\S][[:punct:]]*\.pdf$">
        <cfreturn REMatchNoCase(REGEXPMATCH,RAWHTML)>
   </cffunction>

TIA

IIS 6