Validate comma separated numbers

Question

I have to check if a string has this pattern: 1,2,10,11.

The rules are:

• It may be a sequence like: 1 or 1,2 or 1,2,n+1. Many numbers user wants;
• The number must be followed by a comma but can't ends with it, like: 1,;
• The number can have 1 or 2 digits;
• No other character but number and comma, no space or whatever;
• No need to check numbers sequence, this is not the point.

What I have tried is:

• (\d{1,2})(,): This code checks for a 1, sentence and returns true no metters what is on the rest of the string, like 1,afasfs;
• I've tried look ahead: (\d{1,2})(?=(,)) but it accepts the above case too;
• The both cases above I can't apply ^ and $ because it fails on right scenarios like: 1,2,3.

What I don't know is how to test the entire string. All my tests only checks a part of it(e.g 1,) not the entire string.

Note: I'm using JavaScript test() function. Don't know if is the right one, but I believe that it is.

Answer 1

per OP

The number must be followed by a comma

so a little modification to anubhava's pattern/^(\d{1,2},)+\d{1,2}$/ otherwise it will validate single or double digits only like 1 or 10

Answer 2

You can try this regex:

/^(\d{1,2},)*\d{1,2}$/

Details:

^           - Line start
\d{1,2}     - 1 or 2 digit number
\d{1,2},    - 1 or 2 digit number followed by a comma
(\d{1,2},)* - 0 or more of 1/2 digit number followed by a comma character
\d{1,2}     - 1 or 2 digit number
$           - Line end