> Can't you tell that more easily by seeing if match-beginning returns nil?
Which match-beginning?
One for a subexpression inside the alternative you're trying to test for.
After (string-match "\\(a\\)\\|\\(b\\)\\|\\(c\\)" input)
I can just consult (length (match-data)) for distinguishing between
all three alternatives.
You could, but you'd have to compare the value of that against various
constants, which would be ugly. I think this code is cleaner:
(cond ((match-beginning 1)
...)
((match-beginning 2)
...)
((match-beginning 3)
...)
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