re-builder

re-builder is an interactive autoloaded compiled Lisp function in `re-builder.el'.


(re-builder)

Construct a regexp interactively.
This command makes the current buffer the "target" buffer of
the regexp builder. It displays a buffer named "*RE-Builder*"
in another window, initially containing an empty regexp.

As you edit the regexp in the "*RE-Builder*" buffer, the
matching parts of the target buffer will be highlighted.