Regex to allow any occurrence of one symbol in any position of the string?

Question

I'd appreciate if someone could help..

I need to allow the occurrence of dash (-) in any position of the string (except the beginning).

My RegEx is:

^[+]?[0-9]{3,10}$

I want to allow the following possibilities:

+7-777-77777
7-7-7-7-7-77

etc. so that I could have dash in any place after plus (+) and first digit.

Thank you in advance!

Answer 1

You can use lookahead

^(?=([^\d]*\d){3,10}[^\d]*$)[+]?\d+(-\d+)*$
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           |
           |->match further only if there are 3 to 10 digits in string

This would match string with three to 10 digits optionally having - in between the string

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try it here

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If you want optional space in between the strings

^(?=([^\d]*\d){3,10}[^\d]*$)[+]?\d+(\s*-\s*\d+)*$