19.7 Regular Expression Example

Here is an example of a regexp—the regexp that Emacs uses, by default, to recognize the end of a sentence, not including the following space (i.e., the variable sentence-end-base):

     
     [.?!][]\"'””)}]*

This contains two parts in succession: a character set matching period, ‘?’, or ‘!’, and a character set matching close-brackets, quotes, or parentheses, repeated zero or more times.