Splitting strings at specific positions

Question

I got a little problem here, i'm looking for a better way to split Strings. For example i receive a String looking like this.

0000JHASDF+4429901234ALEXANDER

I know the pattern the string is built with and i have an array of numbers like this.

4,5,4,7,9
0000 - JHASDF - +442 - 9901234 - ALEXANDER

It is easy to split the whole thing up with the String MID command but it seems to be slow when i receive a file containing 8000 - 10000 datasets. So any suggestion how i can make this faster to get the data in a List or an Array of Strings? If anyone knows how to do this for example with RegEx.

Answer 1

var lengths = new[] { 4, 6, 4, 7, 9 };
var parts = new string[lengths.Length];

// if you're not using .NET4 or above then use ReadAllLines rather than ReadLines
foreach (string line in File.ReadLines("YourFile.txt"))
{
    int startPos = 0;
    for (int i = 0; i < lengths.Length; i++)
    {
        parts[i] = line.Substring(startPos, lengths[i]);
        startPos += lengths[i];
    }

    // do something with "parts" before moving on to the next line
}