2.39.7.6 Named character sets

any

Match any character. Equivalent to ‘ascii’ in an ASCII context.

nonl

Match any character other than ‘#\return’ or ‘#\newline’.

ascii

Match any ASCII character [0, 127].

lower-case

lower

Matches any character for which char-lower-case? returns true. In a Unicode context this corresponds to the ‘Lowercase’ (‘Ll’ + ‘Other_Lowercase’) property. In an ASCII context corresponds to ‘(/ "az")’.

upper-case

upper

Matches any character for which char-upper-case? returns true. In a Unicode context this corresponds to the ‘Uppercase’ (‘Lu’ + ‘Other_Uppercase’) property. In an ASCII context corresponds to ‘(/ "AZ")’.

title-case

title

Matches any character with the Unicode ‘Titlecase’ (‘Lt’) property. This property only exists for the sake of ligature characters, of which only 31 exist at time of writing. In an ASCII context this is empty.

alphabetic

alpha

Matches any character for which char-alphabetic? returns true. In a Unicode context this corresponds to the ‘Alphabetic’ (‘L’ + ‘Nl’ + ‘Other_Alphabetic’) property. In an ASCII context corresponds to ‘(w/nocase (/ "az"))’.

numeric

num

Matches any character for which char-numeric? returns true. In a Unicode context this corresponds to the ‘Numeric_Digit’ (‘Nd’) property. In an ASCII context corresponds to ‘(/ "09")’.

alphanumeric

alphanum

alnum

Matches any character which is either a letter or number. Equivalent to ‘(or alphabetic numeric)’.

punctuation

punct

Matches any punctuation character. In a Unicode context this corresponds to the ‘Punctuation’ (‘P’) property. In an ASCII context this corresponds to ‘"!\"#%&'()*,-./:;?@[\]_{}"’.

symbol

Matches any symbol character. In a Unicode context this corresponds to the ‘Symbol’ property (‘Sm’, ‘Sc’, ‘Sk’, or ‘So’). In an ASCII context this corresponds to ‘"$+<=>^`|~"’.

graphic

graph

Matches any graphic character. Equivalent to ‘(or alphanumeric punctuation symbol)’.

whitespace

white

space

Matches any whitespace character. In a Unicode context this corresponds to the ‘Separator’ property (‘Zs’, ‘Zl’ or ‘Zp’). In an ASCII context this corresponds to space, tab, line feed, form feed, and carriage return.

printing

print

Matches any printing character. Equivalent to ‘(or graphic whitespace)’.

control

cntrl

Matches any control or other character. In a Unicode context this corresponds to the ‘Other’ property (‘Cc’, ‘Cf’, ‘Co’, ‘Cs’ or ‘Cn’). In an ASCII context this corresponds to:

`(/ ,(integer->char 0) ,(integer-char 31))

hex-digit

xdigit

Matches any valid digit in hexadecimal notation. Always ASCII–only. Equivalent to:

(w/ascii (w/nocase (or numeric "abcdef")))