[Work] emacs -- insert a new line

Q: How do I embed a newline in a regexp I'm typing into the minibuffer?

A: You use the key sequence C-q C-j. The C-q invokes the Emacs `quoted-insert' command, which basically says "insert the next character literally, without invoking any commands with it." C-j (i.e., control-j) is how a newline character is represented in Emacs.

C-q is a useful general-purpose Emacs command. Whenever you want to insert a character (in the minibuffer or a regular buffer), and it's just refusing to go in, C-q will almost always do the trick.

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