Regular expression for 10 numeric digits

Question

10 numeric digits, may be in the following formats: 123-4-567890, 1234-567890 or 1234567890

What is the regular expression for above digits?

Any help is appreciated.

Thanks.

Downvoting because you haven't shown any research effort and you haven't tagged what language you're using as per the [tag:regex] tag. — zzzzBov, Dec 02 '15 at 05:49

score 0 · Accepted Answer · answered Dec 02 '15 at 05:45

Assuming you mean any digit, 0-9, should be found if (and only if) it meets the three formats you presented, one regex that would work is

(([0-9]{3}-[0-9]{1}-[0-9]{6})|([0-9]{4}-[0-9]{6})|([0-9]{10}))

The above breaks down to three separate patterns, one for each case you presented, separated by regex's equivalent of "or", the | character. Each of the statements above contains [0-9], a character class which will match any digit. Following each character class is a {n} statement, which means "repeat the previous item n times".

Disclaimer, there is probably a cleverer way to do this with a shorter pattern, but my regex-foo isn't quite that advanced yet

Regular expression for 10 numeric digits

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