From: 7stud -- <bbxx789_05ss@...>
Date: 2009-04-29T11:37:12+09:00
Subject: Re: Issue with regexp pattern matcher withing String#gsub

Craig Jolicoeur wrote:
> ## the question is why can I do string concat with + $1 in the first
> regexp and
> ## why am I unable to do it in the second regexp where doing str + $1
> throws the error??

There's no match with the second regex, so all of the regex $ variables
are set to nil.  Your second regex requires that the character "?" be in
the string.  It isn't.
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