A interpreter for regex search, just for learning.
parse a regex struct from string, for example:
(parse-regex "(a|b|c)")
;;=>
;;(Choice
;; `(,(Sequence
;; `(,(Group
;; (Choice
;; `(,(Sequence `(#\a))
;; ,(Sequence `(#\b))
;; ,(Sequence `(#\c))))
;; false
;; false)))))
(parse-regex "[^a-z_]{1,2}")
;;=>
;;(Choice
;; `(,(Sequence
;; `(,(Repeat (Range `((#\a . #\z) #\_) true) 1 2 true)))))match string with given regex, for example:
(let ([r (parse-regex "http://([a-zA-Z0-9_]+\\.?)+(/.*?)(\\?[^ ]+)")]
[str "http://www.bilibili.com/some/path?some=query rest"])
(match-regex r str))
;;=>
;;"http://www.bilibili.com/some/path?some=query"
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