Re: replace-match: end of the replacement text for strings

[Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Großjohann)]

Roland Winkler <Roland.Winkler@physik.uni-erlangen.de> writes:

> "Stefan Monnier <foo@acm.com>" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu> writes:
>
>> >>>>> "Roland" == Roland Winkler <Roland.Winkler@physik.uni-erlangen.de> writes:
>> > When I use replace-match to operate on a string, is there an easy
>> > way to find out the end of the replacement text in the string that
>> > is returned by replace-match (like point in a buffer)? I have in
>> > mind the situation when the optional arg LITERAL is nil, i.e., the
>> > replacement text is `derived' from the string that is passed to
>> > replace-match.
>> 
>> You should be able to get it by looking at the size of the string
>> before and after replacement as well as the size of the replaced
>> text. It's a bit round-about, but I can't think of any other way.
>
> In general, doesn't this work only when I know the replacement text
> -- which I don't know when I have LITERAL set to nil and I am using
> something like "\1" in the replacement?

You need to do some arithmetic to find out the value you want.

length of replaced text = new length of string
                        - old length of string 
                        + length of text to be replaced

kai
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