Every once in a while I want to replace all instances of values like:
<BarFoo>
with
<barfoo>
i.e. do a regular expression replace of all things inside angle brackets with its lowercase equivalent.
Anyone got a nice snippet of Lisp that does this? It's safe to assume that we're dealing with just ASCII values. Bonus points for anything that is generic enough to take a full regular expression, and doesn't just handle the angle brackets example. Even more bonus points to an answer which just uses M-x query-replace-regexp
.
Thanks,
Dom
How to use RegEx with . replace in JavaScript. To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/ . This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring.
Simple Search and Replace Operations When you want to replace every instance of a given string, you can use a simple command that tells Emacs to do just that. Type ESC x replace-string RETURN, then type the search string and press RETURN. Now type the replacement string and press RETURN again.
Try M-x query-replace-regexp
with "<\([^>]+\)>"
as the search string and "<\,(downcase \1)>"
as the replacement.
This should work for Emacs 22 and later, see this Steve Yegge blog post for more details on how Lisp expressions can be used in the replacement string.
For earlier versions of Emacs you could try something like this:
(defun tags-to-lower-case () (interactive) (save-excursion (goto-char (point-min)) (while (re-search-forward "<[^>]+>" nil t) (replace-match (downcase (match-string 0)) t))))
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