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03/02/2009 at 09:12AM PST, ID: 24190629
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8.6

RegEx: help fine-tune url string matching

Asked by MichaelEvangelista in ColdFusion Application Server, Miscellaneous Programming, Scripting Languages

Tags: ColdFusion, RegEx, URL

I have a CF function - gleaned, I think, from a previous ExEx response - which takes a large amount of plain text or html, and finds all of the url strings that are not already linked, beginning with "www" or "http", and creates actual hyperlinks when output to the page.

It works pretty well, but there are a few issues I am hoping to fine-tune.

1) Most important - if there is not a space after the last character of the url (i.e. ".com" is followed by a period, or, if html, by a closing </p> tag with no space), those characters get included in the match and I end up with a bad link.

2) I need this to also match "https://" links, which means altering the way it does the 'replace ' part of the function, since the http:// is currently hard coded.

Note - the 'request.smartlinknew' is my own code, using David Powers' SmartLink JS to open these links in a new window.

Thanks in advance for your help!

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<cffunction name="LinkURLs" output="true" returntype="string">
 
<cfargument name="text" type="string" required="yes">
<!--- Define local variables --->
<cfset var pos=1>
<cfset var subex="">
<cfset var done=false>
<cfset results = arguments.text>
 
<cfloop condition="not done">
 
<!--- Perform search --->
<cfset subex=reFind("(http://|http://www|www)(.*?)([[:space:]]|$)", arguments.text, pos, true)>
<!--- Anything matched? --->
<cfif subex.len[1] is 0>
<cfset done=true>
<cfelse>
<cfsavecontent variable="theLink"><a href="http://#replace(mid(text,subex.pos[1],subex.len[1]),'http://','')#" #request.SmartLinkNew#>#mid(text,subex.pos[1],subex.len[1])#</a></cfsavecontent>
<cfset results = replace(results,mid(text,subex.pos[1],subex.len[1]),theLink)>
<!--- Reposition start point --->
<cfset pos=subex.pos[1]+subex.len[1]>
</cfif>
</cfloop>
 
<!--- and return results --->
<cfreturn results>
</cffunction>
[+][-]03/04/09 05:32 AM, ID: 23794510

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[+][-]03/04/09 05:39 AM, ID: 23794569

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About this solution

Zones: ColdFusion Application Server, Miscellaneous Programming, Scripting Languages
Tags: ColdFusion, RegEx, URL
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Solution Provided By: steeza
Participating Experts: 1
Solution Grade: A
 
 
[+][-]04/11/09 12:28 PM, ID: 24123159

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[+][-]04/11/09 12:50 PM, ID: 24123239

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