common-lisp Regular Expressions Binding register groups with CL-PPCRE
Example
CL-PPCRE:REGISTER-GROUPS-BIND will match a string against a regular expression, and if it matches, bind register groups in the regex to variables. If the string does not match, NIL is returned.
(defun parse-date-string (date-string)
(cl-ppcre:register-groups-bind
(year month day)
("(\\d{4})-(\\d{2})-(\\d{2})" date-string)
(list year month day)))
(parse-date-string "2016-07-23") ;=> ("2016" "07" "23")
(parse-date-string "foobar") ;=> NIL
(parse-date-string "2016-7-23") ;=> NIL
