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Most languages are case-sensitive, so keywords can only be written with the rules of the keyword (case-sensitive), and the Regular Expression (RE) which describes the lexemen is very simple

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Most languages are case-sensitive, so keywords can only be written with the rules of the keyword (case-sensitive), and the Regular Expression (RE) which describes the lexemen is very simple. However, some languages such as SQL are not case sensitive, so keywords can be written in lowercase or uppercase, or in any mixture of letters. So, the SQL SELECT keyword can also be written "select", "Select", or "sElEcT".

Question

Explain how to write a Regular Expression to accept keywords but is not case-sensitive.

(You can create it by providing examples of Regular Expressions for the introduction of certain keywords)