Question: 19.4 Write a PHP regular expression pattern that matches a string that satisfies the following description: The string must begin with the (uppercase) letter A.

19.4Write a PHP regular expression pattern that matches a string that satisfies the following description: The string must begin with the (uppercase) letter A. Any three alphanumeric characters must follow. After these, the letter B (uppercase or lowercase) must be repeated one or more times, and the string must end with two digits.

19.5Describe how input from an HTML5formis retrieved in a PHP program.

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