Ben R. Fitzpatrick brfitzpatrick

## swap values in emacs
M-x replace-regexp <RET>
\(dog\)\|cat <RET>
\,(if \1 "cat" "dog") <RET>

Beginning Line 3 with `\,` tells Emacs that this line should be evaluated as a Lisp expression.
The `\1` on Line three referres to the first grouped of characters defined with `(` and `)` on line 2.
Read line 3 as if `\1` replace with "cat" else replace with "dog"
You have to escape (i.e. preceed with `\`) the `(`, `)` and `|` characters for them to be treated as special characters
	M-x replace-regexp <RET>
	\(dog\)\\|cat <RET>
	\,(if \1 "cat" "dog") <RET>

	Beginning Line 3 with `\,` tells Emacs that this line should be evaluated as a Lisp expression.
	The `\1` on Line three referres to the first grouped of characters defined with `(` and `)` on line 2.
	Read line 3 as if `\1` replace with "cat" else replace with "dog"
	You have to escape (i.e. preceed with `\`) the `(`, `)` and `\|` characters for them to be treated as special characters