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
• 12-456879×54
• 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.

Answer 1

/^\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.