RegEx for JavaScript中的电话号码

Question

I was using RegEx to validate user phone numbers. I have set of requirements for phone number validation. I dont have much idea about the RegEX. can anyone help me to provide a matching reqex for my requirement. Here the validation is very simple.

Conditions

 1. It should allow numbers from 0-9.
 2. It should allow + sign. (+ sign is not mandatory but not allow after even a single letter (ie: should be placed at front.)).
 3. It should allow - sign. (- sign is also not mandatory and can be placed anywhere)
 4. It should allow empty space everywhere.
 5. No dots or no other chars allowed except the above said things.

Correct values

+65-12345678
65-12345678
6512345678
65 12345678
65 123 45678
65 123-45678
+65 123-45678
1234

InCorrect values

12345+86666
123alpha

Thanks

Answer 1

Based on your samples, try this:

^(?:\+?\d{2}[ -]?\d{3}[ -]?\d{5}|\d{4})$

It will match all the correct values.

DESCRIPTION:

DEMO:

http://regexr.com?340nf

Answer 2

Just to help you build some concepts.
The following regex would match the first seven inputs you provided.

/^\+?\d{2}[- ]?\d{3}[- ]?\d{5}$/

\\+? would match a + sign. The ? in it makes the + sign optional.
\\d{2} matches two digits
[- ]? matches either a - or a (space). ? makes the occurrence of - or (space) optional.
\\d{5} then matches 5 digits.
^ and $ are the start and end anchors.

Answer 3

根据你的样品尝试这种模式。

^(?:\+?\d{2}[ -]?[\d -][\d -]+)$