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Vls-datestr-p

Recognize strings of the form YYYY-MM-DD*.

Signature

(vls-datestr-p x) → *

Arguments

x — Guard (stringp x).

Definitions and Theorems

Function: vls-datestr-p

(defun vls-datestr-p (x)
  (declare (xargs :guard (stringp x)))
  (let ((__function__ 'vls-datestr-p))
    (declare (ignorable __function__))
    (and (<= 10 (length x))
         (str::dec-digit-char-p (char x 0))
         (str::dec-digit-char-p (char x 1))
         (str::dec-digit-char-p (char x 2))
         (str::dec-digit-char-p (char x 3))
         (eql (char x 4) #\-)
         (str::dec-digit-char-p (char x 5))
         (str::dec-digit-char-p (char x 6))
         (eql (char x 7) #\-)
         (str::dec-digit-char-p (char x 8))
         (str::dec-digit-char-p (char x 9)))))