CODEWITHSUNDEEP
javaregex
Artem P.
Artem P.

Reputation: 105

String with N digits

I need some help with regex in Java.

We have string, and I want that String.matches give me "true" if our string contains N digits.

For example(N = 12):

+012345678900 - true

0123-4567-0000 - true;

but:

+0123456789 - false

0123-4567-000000 - false.

I tried this one (.*[0-9].*){N}and this one ^(.*[0-9].*){N}$. But it was incorrectly.

Upvotes: 4

Views: 327

Answers (1)

Avinash Raj
Avinash Raj

Reputation: 174696

You may try this,

^(?:\\D*\\d){12}\\D*$

matches method won't need anchors, so

(?:\\D*\\d){12}\\D*

would be enough..

\\D matches any character but not of digit. So (?:\\D*\\d){12} ensures that there must be any no of non-dgit chars but it must contain exactly 12 digits. Last \\D* matches zero or more non-digit characters.

Upvotes: 5

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