Regular expression in C# parse into double array

Question

I'm not to good in Regular Expressions. I have

string rgba = "[0.123,0.223,0.2,1]";

What would be the best way to covert it into double[] ?

• Ming-Tang: assuming rgba strings have no spaces? (like [0.1, 1.0, 0.5, 1 ]

Answer 1

rgba.Replace("]", String.Empty)
 .Replace("[", String.Empty)
 .Split(',')
 .Select(double.Parse)
 .ToArray();

Or if you know that it will always start with [ and end with ]

rgba.Substring(1, rgba.Length - 2)
 .Split(',')
 .Select(double.Parse)
 .ToArray();

And if you don't like LINQ

Array.ConvertAll(rgba.Substring(1, rgba.Length - 2).Split(','), double.Parse);

Regex is quite expensive to use, and I wouldn't recommend it in this case.

Answer 2

You can use a regex with body:

\d+\.\d*

The regex will match one or more digits, then a single dot, then any number of digits.