First off, is there a way to make ... in a pattern match non-greedily? i.e., match as *few* elements as possible instead of as many?
Second, is there a way to make one pattern refer to an earlier pattern in the same match clause? Semi-regularly I find myself wanting to do something like 'match repeated elements' or 'match if items from these two lists match'. For example: (match (list '(a b c) '(d e c)) [(list (list _ ... x) (list _ ... y)) #:when (equal? x y) 'ok] [else 'nope]) => 'ok (match '(a b c c d) [(list _ ... x y _ ...) #:when (equal? x y) 'ok] [else 'nope]) => 'ok Is there a way to do this without needing a #:when clause? -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAE8gKoe78-7sBjHu%3DoR6kg4t4xqaTXjOAa1bHoE_G%2BZKpW6%3DTw%40mail.gmail.com.
