From: "F. Senault" <fred@...>
Date: 2009-05-20T02:05:09+09:00
Subject: Re: Problem with Regular Expression

Le 19 mai � 18:54, Mario Ruiz a �crit :

> I'm replacing a string using:
> xmlString.gsub!(/:#{tagName}>#{oldValue}<\//i,":" + tagName + ">" +
> value + "</")
> 
> It works perfectly but... if oldValue contains the character +, it
> doesn't work.
> 
> Do you know how to solve this?

When you interpolate strings into a regexp, the special chars are taken
as part of the regexp (meaning your '+' means one or more of the
expression before).  If you want to match literals, use Regexp.escape :

xmlString.gsub!(/:#{Regexp.escape(tagName)}>#{Regexp.escape(oldValue)}<\//i
...

>> Regexp.escape("abc+")
=> "abc\\+"
>> Regexp.escape("abc[]+")
=> "abc\\[\\]\\+"

Fred
-- 
When your pubic hair's on fire,          something's wrong
When you think you're the Messiah,       something's wrong
When you mistake a plane for Venus,      something's wrong
When your girlfriend's got a penis...    (K's Choice, Something's wrong)