The following two functions move point over a specified set of characters. For example, they are often used to skip whitespace. For related functions, see Motion and Syntax.
These functions convert the set string to multibyte if the buffer is multibyte, and they convert it to unibyte if the buffer is unibyte, as the search functions do (see Searching and Matching).
skip-chars-forwardcharacter-set &optional limit
This function moves point in the current buffer forward, skipping over a given set of characters. It examines the character following point, then advances point if the character matches character-set. This continues until it reaches a character that does not match. The function returns the number of characters moved over.
The argument character-set is a string, like the inside of a
‘[…]’ in a regular expression except that ‘]’ does not
terminate it, and ‘\’ quotes ‘^’, ‘-’ or ‘\’.
"a-zA-Z" skips over all letters, stopping before the
first nonletter, and
"^a-zA-Z" skips nonletters stopping before
the first letter. See See Regular Expressions. Character classes
can also be used, e.g.,
"[:alnum:]". See see Char Classes.
If limit is supplied (it must be a number or a marker), it specifies the maximum position in the buffer that point can be skipped to. Point will stop at or before limit.
In the following example, point is initially located directly before the ‘T’. After the form is evaluated, point is located at the end of that line (between the ‘t’ of ‘hat’ and the newline). The function skips all letters and spaces, but not newlines.
---------- Buffer: foo ---------- I read "∗The cat in the hat comes back" twice. ---------- Buffer: foo ----------
(skip-chars-forward "a-zA-Z ") ⇒ 18 ---------- Buffer: foo ---------- I read "The cat in the hat∗ comes back" twice. ---------- Buffer: foo ----------
skip-chars-backwardcharacter-set &optional limit
This function moves point backward, skipping characters that match
character-set, until limit. It is just like
skip-chars-forward except for the direction of motion.
The return value indicates the distance traveled. It is an integer that is zero or less.