Regex syntax

regex

(regex group )

group

fragment* (:as :a-name)? ; capturing only when named

fragment

\character

"string"

{ (char char)* } ; char ranges, both ends inclusive

[ group ]

#{ fragment* } ; alternative

a-symbol ; must evaluate to a fragment

(some clojure code) ; must evaluate to a fragment

; predefined helpers:

any ; 1-character wildcard, aka .

(repeat fragment ) ; 0 to ∞

(repeat fragment min ) ; min to ∞

(repeat fragment min max ) ; min to max

(* group ) ; shorthand for (repeat [group])

(+ group ) ; shorthand for (repeat [group] 1)

(? group ) ; shorthand for (repeat [group] 0 1)

char

\character

a-symbol ; must evaluate to a character

(some clojure code) ; must evaluate to a character