Capturing Group Regex Javascript match returns two values why?

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Why does "abcabcabc".match(/(abc){3}/);

return two entries ["abcabcabc", "abc"]? both "abcabcabc" and "abc"

similarly,

["1234", "1234"]

asked 13 secs ago

ish2f4f

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Capturing Group Regex Javascript match returns two values why?