CODEWITHSUNDEEP
jsonregex
mmm20
mmm20

Reputation: 31

Combining two regexes

I'm trying to combine two regexes. One will ensure that input contains 14 digits: ^\\d{14}$ and I need another regex to check if all the input is not of the same digit. Please suggest how I proceed with this. I want my regex to check for that the input is 14 digits and those digits are not all same numbers [0-9].

Is there a way I add the test for finding not all digits are the same with my regex that checks for if the input is exactly 14 digits? I would need one regex expression which combines them both. Thank you!

Upvotes: 0

Views: 80

Answers (2)

trincot
trincot

Reputation: 350272

You can use negative lookahead with a back reference to the first digit:

(?!(\d)\1{13})\d{14}$

NB: This is pure regex syntax. I did not escape backslashes for use in a programming language.

Upvotes: 2

Chad Miller
Chad Miller

Reputation: 1475

There is no regex operation for "match here for all-of-these except a back-reference". You have a two-step test here, not a single one.

Upvotes: -1

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