RegEx for pin number

问题

Im looking to create a RegEx for java to validate a Pin Number that needs to be at least exactly 6 character long and not all numbers can be equal.

I got /\d{6}/ but I I'm having a little trouble finding out how to make sure all 6 numbers should be different, so 000000 is invalid, while 000001 should be fine.

回答1:

You can use this regex with a negative lookahead assertion:

^(\d)(?!\1+$)\d{5}$

RegEx Demo

RegEx Details:

• ^: Start
• (\d): Match and capture first digit in group #1
• (?!\1+$): Negative lookahead to assert we don't have repetitions of same digit till end
• \d{5}: Match remaining 5 digits
• $: End

来源：https://stackoverflow.com/questions/46435883/regex-for-pin-number