Help with regex (why does my regex match this string)

1

Hello! I am working on the Telephone Number Validator project and am struggle to understand why this regex is returning as true when tested against certain strings.
My regex is:

/\d?\s?-?\d{3}\s?-?\d{3}\s?-?\d{4}/

and the string that it matches is:

"27576227382"

Though given the regex I feel like it should match a string which has exactly 10 or exactly 11 digits because I specifically define how many digits it should have in each spot? I am misunderstanding something somewhere that is always this string to have more digits.

2

I personally struggle hard with RegEx. It helps me better when I use a visualizer. You can search Google and try to find others, but my personal bookmark is:
https://regexr.com/

You can put examples of the tests in there and kind of see what is going on.

3

you have nothing that say that your match must be of the whole string, so it is matching a part of the string - the 10/11 digits and returning true