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How to make a regular expression case insensitive?

I am working on a Drupal Commerce shipping rule and it needs a regular expression to compare postcodes with the buyers address as below;

/^AB37|^AB38|^AB41/

I am finding this code to be case sensitive and I need it to be more relaxed allowing lowercase or mixed.

I have read I need a ‘i’ flag, but I am unsure how to apply this.

Could somebody please provide me with an example?

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How to make a regular expression case insensitive?

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