Differentiate regular grammar and regular expression.

Regular expression is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching. It includes the following elements:

Example: A and B are regular expressions then

• The regular expression is A. B (concatenation)
• The regular expression (alternation) is A l B
• The regular expression (Kleene Star) is A*

Regular Grammars

There are 4 tuples in Regular Grammars (N, ∑, P, S € N). In this formula, N stands for the non-terminals’ sets, ∑ means the set of terminals, P is the set of productions to change the start symbol, P has its productions from one of the types and lastly S is the start non-terminal.