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The + quantifier means "1 or more". The \1 refers to the captured group, which is the same thing the quantifier is referring to. So effectively, it's saying "group aa, 1 or more times, and then one more time". Which is the same as "2 or more times". So the regex might be clearer as this: /(aa){2,}/ Since aaaaaa is three sets of the aa group, the regex matches the string.
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