Re: where is a description for use of regexp replace

["John E. Davis" <davis>]

Joachim Schmitz <js@xxxxxxxxxxxxx> wrote:
>So I have to replace all occurences such as:
>
><img src="images/keyvisual3" width="567" height="20">
>
>with
>
><img src="images/keyvisual3" width="567" height="20" />

  Using the query_replace_match function, accessable via the
"Search->Regexp Replace" menu item (also as "ESC %" in emacs
bindings), enter
   src="\([^>]+\)>
at the first prompt and
   src="\1/>
at the second.

  Note the occurance of \(...\) in the first expression.  It defines a
group.  That the characters in the group are represented by \1 in the
second expression.  Unfortunately, this is yet another example of how
poorly documented jed is.  The slang documentation for the
string_match_nth function is somewhat better:

string_match_nth

 SYNOPSIS
   Get the result of the last call to string_match

 USAGE
   (Integer_Type, Integer_Type) = string_match_nth(Integer_Type nth)

 DESCRIPTION
   The `string_match_nth' function returns two integers describing
   the result of the last call to `string_match'.  It returns both
   the offset into the string and the length of characters matches by
   the `nth' submatch.
   
   By convention, `nth' equal to zero means the entire match.
   Otherwise, `nth' must be an integer with a value 1 through 9,
   and refers to the set of characters matched by the `nth' regular
   expression enclosed by the pairs `\(, \)'.

 EXAMPLE
   Consider:

        variable matched, pos, len;
        matched = string_match("hello world", "\\([a-z]+\\) \\([a-z]+\\)", 1);
        if (matched) (pos, len) = string_match_nth(2);

   This will set `matched' to 1 since a match will be found at the
   first position, `pos' to 6 since `w' is offset 6 characters
   from the beginning of the string, and `len' to 5 since
   `"world"' is 5 characters long.

 NOTES
   The position offset is _not_ affected by the value of the offset
   parameter to the `string_match' function. For example, if the
   value of the last parameter to the `string_match' function had
   been 3, `pos' would still have been set to 6.
   
   Note also that `string_match_nth' returns the _offset_ from
   the beginning of the string and not the position of the match.

 SEE ALSO
   string_match
[Obtained from file /usr/local/doc/slang/slangfun.txt]
-----------------------------------

Good luck,
--John

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