Question: PHP Although the client-side validation checks the correct form of the booking reference, it does not actually check it is a valid booking reference. For

PHP Although the client-side validation checks the correct form of the booking reference, it does not actually check it is a valid booking reference.

For a reference to be valid, the three-letter group must be one of ZRE, FGH, TYU. Anything else is invalid.

How to write the expression to check the combination... Thank you for the help

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