I\'m having trouble with regular expressions. Here is the question to my homewor

Question

I'm having trouble with regular expressions. Here is the question to my homework to answer.

define a regular expression pattern that completely matches a valid identifier in the python programming language. python requires that a valid identifier start with either an alphabetic character or an underscore and be followed by any number of additional alphabetic chracters, digits, or underscores. your expression should only match strings that exactly follow the identifier rules with no characters unaccounted for.

Explanation / Answer

[a-zA-Z_][A-Z0-9._%+-]+

In this [a-zA-Z_] represents that the first character is either a small letter, a capital letter or an underscore.

That is followed by [A-Z0-9._%+-] which represents that it can have a series of letters, digits, dots, underscores, percentage signs and hyphens.

The '+' at the end represents that we can have multiple [A-Z0-9._%+-].

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