Re: [External] : Re: query-replace-regexp on a string with '=' sign

[Emanuel Berg]

Drew Adams wrote:

>>> HELLO=WORLD
>>> I want to downcase the part before the equal (=) sign.
>> 
>> (while (re-search-forward "\\(.+\\)\\(=\\)" nil t)...
>
> In most cases you don't want the first group to match any
> `=' chars, in which case it should be something like
> \([^=]+\).

I don't know why mine works, why not everything including the
equals sign _and_ the part after that ends up in the first
group?

But it does work, while replacing the RE with
"\\([^=]+\\)\\(=\\)" doesn't, it downcases the whole thing.

Here, try it yourself:

(while (re-search-forward "\\(.+\\)\\(=\\)" nil t)
  (replace-match
   (concat (downcase (match-string-no-properties 1))
           (match-string-no-properties 2) ) t))

;; We=WE
;; Are=ARE
;; Robots=ROBOTS

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