Question

Is a given string in the language

Answer 1

Answer:

Given a string str, the task is to check if the string is a valid identifier or not. In order to qualify as a valid identifier, the string must satisfy the following conditions:

Explanation:

It must start with either underscore(_) or any of the characters from the ranges [‘a’, ‘z’] and [‘A’, ‘Z’].

There must not be any white space in the string.

And, all the subsequent characters after the first character must not consist of any special characters like $, #, % etc.