Common Regular Expressions: ID card number verification regular expressions,

Common Regular Expressions: ID card number verification regular expressions,

A simple regular expression used to verify the ID card number is required. I checked a lot from the Internet and found some problems. I checked the manual for half a day, the following formula can meet simple requirements:
1. 15 or 18 digits. If it is 15 digits, it must be all digits.
2. If it is 18 digits, the last digit may be a number or a letter Xx, and the remaining digits must be digits.

/^ (\ D {15} | \ d18 | ^ \ d {17} (\ d | X | x) $/

From this expression:
1. Regular Expressions must first pass the correct
2. The restriction is incorrect.
3. You do not need to limit one of these rules, but you must first pass the rule correctly.