From string const STR = ‘qwbewrbbeqqbbbweebbbbqee’; Can get result [” b “, “bb”, “BBB”, “BBBB”]

From string const STR = ‘qwbewrbbeqqbbbweebbbbqee’; [“b”, “bb”, “BBB “,” BBBB “] (B)

A.str.match(/b+/g)
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B.str.match(/b*/g)
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C.s. tr. Match ({1, 4} / g/b)Copy the code

D.s tr. Match ({1, 5} / g/b)Copy the code

Resolution:

+ means that b occurs at least once

* indicates that B can occur once or more than once

{n,m} indicates that b occurs at least n times and at most m times