In addition to useful special characters in search pattern matching, vim can also do some excellent stuff in the second phrase of its substitution statements, a

In addition to useful special characters in search pattern matching, vim can also do some excellent stuff in the second phrase of its substitution statements, as documented in sub-replace-special: http://vimdoc.sourceforge.net/htmldoc/change.html#sub-replace-special http://vimdoc.sourceforge.net/htmldoc/change.html#sub-replac... I find \U, \L and \E to be most useful, for example: :%s/ALL_CAPS_\(.*\)_HUZZAH/SOME_LOWERCASE_\L\1\E_HUZZAH/g Will translate "ALL_CAPS_IS_GREAT_HUZZAH" to "SOME_LOWERCASE_is_great_HUZZAH". Super handy in certain situations. It's also worth noting that these "magic" settings affect :s, :g, / and ?.