REGEX to check if a number is repeated in a string

I need a regex that check if a number is repeated in a string of 9 char, knowing that the chars could be an indefinite number of dots

Examples

"........." - false - no numbers repeated
"123456789" - false - no numbers repeated
"1.2.3.4.5" - false - no numbers repeated
"1...3...5" - false - no numbers repeated
"112345678" - true - number 1 is repeated
"1......1." - true - number 1 is repeated
"11244.56." - true - number 1 and 4 are repeated
"234.5.6.4" - true - number 4 is repeated

I found this looking around on internet that is close to what i need

\b(?:([1-9])(?![1-9]*\1)){1,9}\b

But I don't know how to make it not consider dots Thanks very much :)

Solution

You can use

^(?=.{9}$)(?=.*(\d).*\1)(?:\.*\d){1,9}\.*$

Or, if you need to only allow digits from 1 to 9:

^(?=.{9}$)(?=.*([1-9]).*\1)(?:\.*[1-9]){1,9}\.*$

See this regex demo.

Details:

^ - start of string
(?=.{9}$) - the string should contain 9 chars
(?=.*(\d).*\1) - there must be a repeating digit
(?:\.*\d){1,9}\.* - 1 to 9 occurrences of any zero or more dots followed with a digit and then any zero or more dots
$ - end of string.