Please directly show me the steps and results, negative vote for incomplete or incorrect answers

Research to write down the rule of a variable identifier in the following programming languages and write down the regular grammar for that rule. For example, as elaborated in the class, the rule of a variable identifier in C is "start either byor any alphabetic character, and then follow either byany alphabetic character, or number", and its regular grammar is: t_a_2A-Z)(a-zA-ZO-91+ 2. a. JavaScript i. (1 point) Rule: Solution: i. (4 points) Regular grammar: Solution: b. PHP i. (1 point) Rule Solution: i. (4 points) Regular grammar: Solution