正则表达式分割逗号分隔括号，应该很容易

Question

To all: I have this string:

"{1,2,3},{4},{3}"

That I want to split to an array like this:

    {1,2,3}
    {4}
    {3}

The pattern I am using ",\\{([^)]*)\\}," is only partially working and giving me an array of:

    {1,2,3}
    4
    {3}

I am doing this:

string[] strs = Regex.Split(string, pattern)

I can't figure out what I am missing so that the 2nd value is missing the braces. I've been banging my head against the wall. Any help is greatly appreciated.

Thanks!

Answer 1

You can use the following regex to split:

(?<=\}),(?=\{)

This matches all commas , that are preceded by } and have } after them.

RegexHero Demo

Answer 2

you can just use split andd add the pare you've put out:

string[] splitted = str.Split("},{");


for(int i = 0; i < splitted.Count ; i++)
{
  if(i != 0)
  {
     Console.WriteLine("{");
  }
  Console.WriteLine(curr[i]);
  if(i != splitted.Count - 1)
  {
      Console.WriteLine("}");
  }
}

Answer 3

The "pure Regex" answer is like this:

        string str = "{1,2,3},{4},{3}";
        string[] strs =
            Regex.Matches(str, @"({.*?})")
                 .OfType<Match>()
                 .Select(m => m.Groups[0].Value)
                 .ToArray();

which is more tolerant of different - or even mixed - separators between the braced groups, such as comma-space or space rather than just a comma. If your input string is well-defined then this won't be an issue, but I prefer to be able to handle inputs which might come from different sources and might not quite conform.