It's been a long day, so I may well have missed something, but here we go
anyway...
One caveat - this assumes at least semi-valid markup - in so far as no > inside
of A opening tag/attributes.
(Not impossible to fix, but since it's not valid I can't be bothered going that
far right now.)
<cffunction name="setHyperlinkRel" returntype="String" output="false">
<cfargument name="LinkCode" type="String"/>
<cfargument name="RelValue" type="String"/>
<cfargument name="Append" type="Boolean" default="true"/>
<cfargument name="Delimiter" type="String" default=","/>
<cfset var Head = ListFirst(Arguments.LinkCode,'>')/>
<cfset var Tail = ListRest(Arguments.LinkCode,'>')/>
<cfset var RelAttr = rematch(
'(?ims)\brel=(?:\S+|([''"]).*?)(?=\1(?:\s|$))' , Head )/>
<cfif ArrayLen(RelAttr)>
<cfif NOT find(RelValue,RelAttr[1])>
<cfset Head = replace
( Head
, RelAttr[1]
, ListAppend( RelAttr[1] , Arguments.RelValue ,
Arguments.Delimiter )
)/>
</cfif>
<cfelse>
<cfset Head = Head & ' rel="#Arguments.RelValue#"' />
</cfif>
<cfreturn Head & '>' & Tail />
</cffunction>
<cffunction name="addRelNofollow" returntype="String" output="false">
<cfargument name="InputText" type="String"/>
<cfset var Result = Arguments.InputText/>
<cfset var NewHyperlink = 0/>
<cfset var i = 0/>
<cfset var Hyperlinks = rematch( '(?ims)<a[^>]+>.*?</a>' ,
Arguments.InputText )/>
<cfloop index="i" from="1" to="#ArrayLen(Hyperlinks)#">
<cfset NewHyperlink = setHyperlinkRel( Hyperlinks[i] ,
'nofollow' ) />
<cfset Result = replace( Result , Hyperlinks[i] , NewHyperlink
)/>
</cfloop>
<cfreturn Result />
</cffunction>
<cfset NewContent = addRelNofollow( OldContent ) />
That works on all the various examples I've tried so far - let me know if
there's anything missed and I'll update it.
Needs ColdFusion 8 or Railo 3 for rematch calls (can do one with Java Regex if
people need it working with other engines).
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