PHP regex for Lebanese phone number

I'm sure there's a slicker way to do it, but

^(961(3|70|71)|(03|70|71))\d{6}$

seems to work, assuming I understand the requirements.

^((961)?(7(0|1))|(961|0)3)[0-9]{6}$

It's a composition of these three regexes:

(961)?(7(0|1))  // 70 and 71 prefixes
(961|0)3        // (0)3 prefix
[0-9]{6}        // main number

Allowing for spaces or common separator chars (though I know you said you weren't concerned about them):

^((961[\s+-]*(3|7(0|1)))|(03|7(0|1)))[\s+-]*\d{6}$

http://regexr.com?2t89v