rxmatch-let[syntax] rxmatch-let match-expr (var ...) form ...
Gauche: evaluates match-expr that should return a <regmatch>? object.
Then binds matched substrings to var ..., and evaluates form ...
See also Concept:RegularExpression, rxmatch-if, rxmatch-cond,
rxmatch-case.
Scsh calls this let-match?.
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