re-let

Arguments: regexp string bindings &body body

regexp and bindings are the same as of re-lambda. string must be an expression that evaluates to a string. This macro evaluates string, matches it with regexp, and if it matches, bind variables with (sub)matches according to bindings, then evaluates body. If string doesn't match regexp, body is not evaluated and nil is returned.

See also re-case and re-lambda.

Example

cl-user(4): (setq f
	      (re-lambda "([^ ]+) ([^ ]+) ([^ ]+)"
		  ((foo 1) (bar 2) (baz 3))
		(list foo bar baz)))
#<Interpreted Function (unnamed) @ #x71ed7892>
cl-user(5): (funcall f "foo the bar")
("foo" "the" "bar")
cl-user(6): (re-let "([^ ]+) ([^ ]+) ([^ ]+)"
		"foo the bar"
		((foo 1) (bar 2) (baz 3))
	      (list foo bar baz))
("foo" "the" "bar")
cl-user(7): 


cl-user(9): (re-case "foo the barmy"
	      ("foo a (.*)" ((it 1)) (list it))
	      ("foo the (.*)" ((it 1)) (list it))
	      (t :no-match))
("barmy")
cl-user(10): (re-case "foo a barmy"
	      ("foo a (.*)" ((it 1)) (list it))
	      ("foo the (.*)" ((it 1)) (list it))
	      (t :no-match))
("barmy")
cl-user(11): (re-case "foo xx barmy"
	      ("foo a (.*)" ((it 1)) (list it))
	      ("foo the (.*)" ((it 1)) (list it))
	      (t :no-match))
:no-match
cl-user(12): 

cl-user(29): (re-let "(abc|def)(.*)" "defabc"
                     ((a 0) (b 1) (c 2))
               (list a b c))
("defabc" "def" "abc")
cl-user(30): 

The symbol naming this operator is also exported from the regexp package.

See The new regexp2 module in regexp.htm for further information on this macro and the regexp2 module.

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This page was not revised from the 10.0 page.
Created 2019.8.20.