From: Joel VanderWerf <vjoel@...>
Date: 2002-07-13T15:15:18+09:00
Subject: Re: gsub() replacement containing replaced text

Harry Ohlsen wrote:
> I want to replace all single quotes in a string with backslask followed by a 
> single quote.  The obvious approach doesn't seem to work, presumably because 
> the replacement contains the pattern that's been replaced.

One way (learned this in a post here a few days ago):

irb(main):001:0> "foo'bar".gsub("'", "\\'")
"foobarbar"
irb(main):002:0> "foo'bar".gsub("'") {"\\'"}
"foo\\'bar"