Which regular expression matches a string containing "ab" followed by any number of occurrences of "a" or "b"? Options : (ab)+(a+b)* ab(a|b)* ab(a|b)+ none
Question
Which regular expression matches a string containing "ab" followed by any number of occurrences of "a" or "b"?
Options : (ab)+(a+b)* ab(a|b)* ab(a|b)+ none
Solution
The correct answer is "ab(a|b)*". This regular expression matches a string that starts with "ab" followed by any number (including zero) of "a" or "b". The "+" in the third option would require at least one more "a" or "b" after "ab", which is not specified in the question. The first option is incorrect because the "+" after "(ab)" would require "ab" to appear at least once more, which is also not specified in the question. The last option is obviously incorrect as it states "none".
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