Regular expression to validate chars by comma

Question

It should validate something like this:

a,b,c,d,1,2,3,w,f,x,-,=,d

Accepted only one char and next is comma.

Bad example:

adc,1,2,345,flos 

I think of thsi:

@"([*{1}]+[,{1}])+"

but this not work.

Answer 1

Try ^[^,](,[^,])*$ . The structure is as follows:

1. a single non comma character: [^,]
2. arbitrary many times a comma followed by a non comma character: (,[^,])*

If you want to match an empty string as well you should make the whole expression optional:

^([^,](,[^,])*)?$

Answer 2

如果您想char with comma从允许的char with comma找到任何组，简单的方法是

(a|b|c|d|1|2|3|w|f|x|\-|\=)\,

Answer 3

It gives you what you want i guess :

bool isMatched = IsValid("adc,1,2,345,flos");   

    private bool IsValid(string value)
    {
            return Regex.IsMatch(value, @"^([^,](,[^,])*)?$");
    }