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33.3.1.2 Character Classes

Here is a table of the classes you can use in a character alternative, and what they mean:

[:ascii:]

This matches any ASCII character (codes 0–127).

[:alnum:]

This matches any letter or digit. (At present, for multibyte characters, it matches anything that has word syntax.)

[:alpha:]

This matches any letter. (At present, for multibyte characters, it matches anything that has word syntax.)

[:blank:]

This matches space and tab only.

[:cntrl:]

This matches any ASCII control character.

[:digit:]

This matches ‘0’ through ‘9’. Thus, ‘[-+[:digit:]]’ matches any digit, as well as ‘+’ and ‘-’.

[:graph:]

This matches graphic characters—everything except ASCII control characters, space, and the delete character.

[:lower:]

This matches any lower-case letter, as determined by the current case table (see Case Tables). If case-fold-search is non-nil, this also matches any upper-case letter.

[:multibyte:]

This matches any multibyte character (see Text Representations).

[:nonascii:]

This matches any non-ASCII character.

[:print:]

This matches printing characters—everything except ASCII control characters and the delete character.

[:punct:]

This matches any punctuation character. (At present, for multibyte characters, it matches anything that has non-word syntax.)

[:space:]

This matches any character that has whitespace syntax (see Syntax Class Table).

[:unibyte:]

This matches any unibyte character (see Text Representations).

[:upper:]

This matches any upper-case letter, as determined by the current case table (see Case Tables). If case-fold-search is non-nil, this also matches any lower-case letter.

[:word:]

This matches any character that has word syntax (see Syntax Class Table).

[:xdigit:]

This matches the hexadecimal digits: ‘0’ through ‘9’, ‘a’ through ‘f’ and ‘A’ through ‘F’.


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