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      clojure.spec.alpha

      • (? pred-form)
      Returns a regex op that matches zero or one value matching
pred. Produces a single value (not a collection) if matched.
      © Rich Hickey. All rights reserved. Eclipse Public License 1.0
      1 Example
      ;; Think of this as a regex like "ab?"
(s/def ::ab (s/cat :a #{:a}
                   :b (s/? #{:b})))

(s/valid? ::ab [:a :b])
; => true

(s/valid? ::ab [:a])
; => true

(s/valid? ::ab [:a :c])
; => false
      See Also
      clojure.spec.alpha/+

      Returns a regex op that matches one or more values matching pred. Produces a vector of matches

      Added by bfontaine
      0 Notes
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