How can I use a regex to tell if a string has 10 digits?

Question

I need to find a regex that tests that an input string contains exactly 10 numeric characters, while still allowing other characters in the string. I'll be stripping all of the non-numeric characters in post processing, but I need the regex for client-side validation. For example, these should all match: - 1234567890 - 12-456879x54 - 321225 -1234AAAA - xx1234567890 But these should not: - 123456789 (not enough digits) - 12345678901 (too many digits) This seems like it should be very simple, but I just can't figure it out.

Accepted Answer

```
/^\D*(\d\D*){10}$/
```

Basically, match any number of non-digit characters, followed by a digit followed by any number of non-digit characters, exactly 10 times.

How can I use a regex to tell if a string has 10 digits?

Solution

Problem