Question

I have quite small but very annoying problem with regex. I would like to find regex for comma separated list which contains nine digits phone number for example :

Pass : 123456789,123456789

Not Pass : 123456789,123456789,

So far, I have something like this :/^\d{9}+(,\d{9}\+)\*$/ Of course it works for example in this tool http://regex.larsolavtorvik.com, but in javascript it does not work and I get this I suppose well known error (for Javascript people) :

Invalid regular expression: /^\d{9}+(,\d{9}\+)\*$/: Nothing to repeat 

So, I added backslash and it looks like this one : /^\d{9}\+(,\d{9}\+)\*$/. Of course this one also does not work.

Answer 1

You are escaping *,+ with \.That is the problem..

* means match the preceding char 0 to many times

+ means match the preceding char 1 to many times

{9} means match the preceding char 9 times..so there is no need of using + after it

The regex should be

/^\d{9}(,\d{9})*$/