: Learning GNU Emacs, 3rd Edition

11.3 Useful Built-in Emacs Functions

Many of the Emacs functions that exist and that you may write involve searching and manipulating the text in a buffer. Such functions are particularly useful in specialized modes, like the programming language modes described in Chapter 9. Many built-in Emacs functions relate to text in strings and buffers; the most interesting ones take advantage of Emacs's regular expression facility, which we introduced in Chapter 3.

We first describe the basic functions relating to buffers and strings that don't use regular expressions. Afterwards, we discuss regular expressions in more depth than was the case in Chapter 3, concentrating on the features that are most useful to Lisp programmers, and we describe the functions that Emacs makes available for dealing with regular expressions.

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