Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:Create a function that will test if a string is a valid
PIN or not via a regular expression.
A valid PIN has:
Exactly 4 or 6 characters.
Only numeric characters (0-9).
• No whitespace.
Examples
validate("121317") → true
validate("1234") → true
validate("45135") → false
validate("89abc1") → false
validate("900876")
→ true
validate(" 4983") false
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