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A common problem facing emacs users is to replace a certain sequence of characters in a buffer with either a newline or tab or something else equally awkward. The solution is relatively simple.

Invoke search and place as normal (M-%), enter the text to be replaced, enter the replacing character using the following chart:

• Newline(\n): C-qC-j
• Tab(\t): C-qC-i
• Carriage return(\r): C-qC-m

See the pattern? C-q is an escape sequence and C-[char] is the position in the alphabet of the ASCII offset of the replacement character. OK, perhaps that's a little tangled. But now you know.