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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