lcletter-digit-chars

(in-package "STR")

(include-book "std/strings/charset" :dir :system)

(include-book "xdoc/constructors" :dir :system)

(local (include-book "std/basic/code-char-char-code-with-force" :dir :system))

(defcharset lcletter/digit
  (b* ((code (char-code x)))
    (or (and (<= (char-code #\a) code)
        (<= code (char-code #\z)))
      (and (<= (char-code #\0) code)
        (<= code (char-code #\9)))))
  :parents (character-kinds)
  :short "Recognize lowercase ASCII letters and decimal digits.")