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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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