c# - How to separate character and number part from string

Question

E.g., I would like to separate:

• OS234 to OS and 234
• AA4230 to AA and 4230

I have used following trivial solution, but I am quite sure that there should be a more efficient and robust solution .

private void demo()
    {   string cell="ABCD4321";
        int a = getIndexofNumber(cell);
        string Numberpart = cell.Substring(a, cell.Length - a);
        row = Convert.ToInt32(rowpart);
        string Stringpart = cell.Substring(0, a);
    }

private int getIndexofNumber(string cell)
        {
            int a = -1, indexofNum = 10000;
            a = cell.IndexOf("0"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("1"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("2"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("3"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("4"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("5"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("6"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("7"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("8"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }
            a = cell.IndexOf("9"); if (a > -1) { if (indexofNum > a) { indexofNum = a; } }

            if (indexofNum != 10000)
            { return indexofNum; }
            else
            { return 0; }


        }

Answer 1

Regular Expressions are best suited for this kind of work:

using System.Text.RegularExpressions;

Regex re = new Regex(@"([a-zA-Z]+)(d+)");
Match result = re.Match(input);

string alphaPart = result.Groups[1].Value;
string numberPart = result.Groups[2].Value;