Node:SRFI-14 Standard Character Sets, Previous:SRFI-14 Character-Set Algebra, Up:SRFI-14

39.12.8 Standard Character Sets

In order to make the use of the character set data type and procedures useful, several predefined character set variables exist.

char-set:lower-case

Variable

All lower-case characters.

char-set:upper-case

Variable

All upper-case characters.

char-set:title-case

Variable

This is empty, because ASCII has no titlecase characters.

char-set:letter

Variable

All letters, e.g. the union of char-set:lower-case and char-set:upper-case.

char-set:digit

Variable

All digits.

char-set:letter+digit

Variable

The union of char-set:letter and char-set:digit.

char-set:graphic

Variable

All characters which would put ink on the paper.

char-set:printing

Variable

The union of char-set:graphic and char-set:whitespace.

char-set:whitespace

Variable

All whitespace characters.

char-set:blank

Variable

All horizontal whitespace characters, that is #\space and #\tab.

char-set:iso-control

Variable

The ISO control characters with the codes 0-31 and 127.

char-set:punctuation

Variable

The characters !"#%&'()*,-./:;?@[\\]_{}

char-set:symbol

Variable

The characters $+<=>^`|~.

char-set:hex-digit

Variable

The hexadecimal digits 0123456789abcdefABCDEF.

char-set:ascii

Variable

All ASCII characters.

char-set:empty

Variable

The empty character set.

char-set:full

Variable

This character set contains all possible characters.