Context-free grammars
If Context-free grammars can symbolize every regular expression, then why do one requires R.E at all?
Expert
The reasons are as follows:
a) Regular Expression are Simpler than the Context-free grammars.
b) This is simpler to construct a recognizer for R.E than the Context-Free grammar.
c) Breaking the Syntactic structure to Lexical and non-Lexical parts give better front end for the Parser.
d) R.E is most powerful in explaining the lexical constructs such as identifiers, keywords and so on while Context-free grammars in symbolizing the nested or block structures of the Language.
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