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