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ColdFusion Rereplace

Posted on 2016-08-17
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Last Modified: 2016-08-22
I am trying to replace some some words from the url but getting the error  message  Malformed regular expression "?target=(top|bottom)".

The url is http://www.kidstuffcatalog.com/return.cfm?target=top

the CF rereplace #rereplace(cookie.lastpage, "?target=(top|bottom)", "","ALL")#
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Question by:erikTsomik
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Expert Comment

by:_agx_
ID: 41760287
The "?" is a special character in regex's and needs to be escaped:

       reReplaceNoCase(cookie.lastpage, "\?target=(top|bottom)", "","ALL")
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by:Terry Woods
ID: 41760789
To explain why the error occurred, the meaning of the ? in a regex is to make the previous character or capturing group optional, which is why the pattern gives an error when the ? is the first character.
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_agx_ earned 500 total points
ID: 41760965
Good explanation.

@erikTsomik - BTW, will the string ever contain other url parameters or could the "target" be in a different position? ie

  http://www.kidstuffcatalog.com/return.cfm?target=top&foo=bar    ... OR
  http://www.kidstuffcatalog.com/return.cfm?foo=bar&target=top 

If so you might need a different expression to avoid breaking the query string. My regex skills are so-so. I am guessing Terry would be of more help with that kind of expression ;-)
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