How to verify that a string contains a valid MySQL VARCHAR data type? [duplicate]

How to verify if a string is of the following format?

VARCHAR(n..m)

Where n >= 0; m > n; m <= 65535

Examples valid strings:

$s = "VARCHAR(100)";
$s = "VARCHAR(1)";
$s = "VARCHAR(65535)";
$s = "varchar(50)";

Examples invalid strings:

$s = "VARCHAR()";
$s = "VARCHAR(70000)";
$s = "VARHAR(50)";
$s = "varchar";

Can this be done with PHP preg_match() or with a different method?

source https://stackoverflow.com/questions/68604835/how-to-verify-that-a-string-contains-a-valid-mysql-varchar-data-type

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