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13.2.5 Quantifiers

The quantifiers *, +, and ? match respectively: zero or more, one or more, and zero or one instances of the preceding subpattern.

(pregexp-match-positions "c[ad]*r" "cadaddadddr") ⇒ ((0 . 11))
(pregexp-match-positions "c[ad]*r" "cr")          ⇒ ((0 . 2))

(pregexp-match-positions "c[ad]+r" "cadaddadddr") ⇒ ((0 . 11))
(pregexp-match-positions "c[ad]+r" "cr")          ⇒ #f

(pregexp-match-positions "c[ad]?r" "cadaddadddr") ⇒ #f
(pregexp-match-positions "c[ad]?r" "cr")          ⇒ ((0 . 2))
(pregexp-match-positions "c[ad]?r" "car")         ⇒ ((0 . 3))

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