I would like to replace forward slashes with backslashes in emacs lisp. If I use this :
(replace-regexp-in-string "\/" "\\" path))
I get an error.
(error "Invalid use of `\\' in replacement text")
So how to represent the backslash in the second regexp?
What you are seeing in "C:\\foo\\bar"
is the textual representation of the string "C:\foo\bar"
, with escaped backslashes for further processing.
For example, if you make a string of length 1 with the backslash character:
(make-string 1 ?\\)
you get the following response (e.g. in the minibuffer, when you evaluate the above with C-x C-e):
"\\"
Another way to get what you want is to switch the "literal" flag on:
(replace-regexp-in-string "/" "\\" path t t)
By the way, you don't need to escape the slash.