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Regular Expressions Interview Questions and Answers

Question - What is lookbehind in Regular expressions?

Answer -

It is working towords to the left to see if match is exist 

Positive Lookbehind:

If match is successful match to the left

Positive lookbehind is specified with ( ?<=...)

Ex: (?<=\d)  successful where digit comes left


Negative Lookbehind:

If match is successful not match to the left

Negative lookbehind is specified with ( ?

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