Question

I am not very experienced with regex and I need to validate phone numbers using javascript.
I have a textbox which need to be allowed to accept multiple phone numbers with a delimiter of ';' and the characters that can be allowed for the phone numbers are

1. Numbers
2. ‘+’
3. ‘-‘

Could someone help me on how I can acheive this using javascript and regex/ regular expressions?

Example:

[phone];[phone];[phone]

I tried the following:

^[0-9-+;]+$

Am not sure if this is correct.

Answer 1

You have placed - in wrong place so, your regex is not working.

Try this(your RegEx, but slightly modified):

^[0-9+;-]+$

or

^[-0-9+;]+$

To include a hyphen within a character class then you must do one of the following:

1. escape the hyphen and use \-,
2. place hyphen either at the beginning or at the end of the character class.

As the hyphen is used for specifying a range of characters. So, regex engine understands [0-9-+;]+ match any of the characters between 0 to 9, 9 to +(all characters having decimal code-point 57[char 9] to 43[char +] and it fails) and ;.