Question: How do you write a Regular Expression in C for Flex that will recognize identifiers? Identifiers can consist of underscores, letters, or digits but MUST

How do you write a Regular Expression in C for Flex that will recognize identifiers? Identifiers can consist of underscores, letters, or digits but MUST start with either an underscore or an upper / lower case letter, have a minimum length of 2 characters, and have at least one letter.

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