Thanks
I did not think about the potential back reference for regexps. Good
catch.
Regards
Erik
On 16 Dec, 17:06, Frederick Cheung <frederick.che...@gmail.com> wrote:
> On 16 Dec 2008, at 15:01, Erik Lindblad wrote:
>
>
>
> > Hi
>
> > I want to substitute single quotes in a string but fails unless
> > resorting to overkill (imho) techniques like blocks:
>
> >>> s = "ab'cd"
> > => "ab'cd"
> >>> s.sub("'") {|s| %q{\'} }
> > => "ab\\'cd"
>
> s.sub("'","\\\\'")
>
> You need four backslashes because:
> - backslashes have to be escaped in a string literal
> - in the case of a sub/gsub subsitution, a backslash has special
> meaning (because you can do stuff like s.sub(/(')/, "x\\1x") #=>
> "abx'xcd"
>
> Fred
>
> > As seen this method works but why can't I do something like
>
> >>> a.sub("'", %q{\'})
> > => "aaabbbbbb"
>
> > when
>
> >>> a.sub("'", %q{h})
> > => "aaahbbb"
>
> > works?
>
> > Can someone shed some light on this? Thanks in advance.
>
> > Regards
>
> > Erik
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