1- Write regular expression to remove special characters from a string in context of the theory of computation. 2- Writ

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1- Write regular expression to remove special characters from astring in context of the theory of computation.2- Write regular expression to remove non alphabetic charactersfrom a string in the context of the theory ofcomputation.3- Write regular expression to remove non numeric characters from astring in the context of the theory ofcomputation.4- Write regular expression to remove URL from a string in thecontext of the theory of computation
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