Question

In C#, how do I compare the characters in two strings.
For example, let’s say I have these two strings
“bc3231dsc” and “bc3462dsc”

How do I programically figure out the the strings
both start with “bc3” and end with “dsc”?

So the given would be two variables:

var1 = "bc3231dsc";  
var2 = "bc3462dsc";  

After comparing each characters from var1 to var2, I would want the output to be:

leftMatch = "bc3";  
center1 = "231";  
center2 = "462";  
rightMatch = "dsc";  

Conditions:
1. The strings will always be a length of 9 character.
2. The strings are not case sensitive.

Answer 1

    static void Main(string[] args)
    {
        string test1 = "bc3231dsc";
        string tes2 = "bc3462dsc";
        string firstmatch = GetMatch(test1, tes2, false);
        string lasttmatch = GetMatch(test1, tes2, true);
        string center1 = test1.Substring(firstmatch.Length, test1.Length -(firstmatch.Length + lasttmatch.Length)) ;
        string center2 = test2.Substring(firstmatch.Length, test1.Length -(firstmatch.Length + lasttmatch.Length)) ;

    }

    public static string GetMatch(string fist, string second, bool isReverse)
    {
        if (isReverse)
        {
            fist = ReverseString(fist);
            second = ReverseString(second);
        }
        StringBuilder builder = new StringBuilder();
        char[] ar1 = fist.ToArray();
        for (int i = 0; i < ar1.Length; i++)
        {
            if (fist.Length > i + 1 && ar1[i].Equals(second[i]))
            {
                builder.Append(ar1[i]);
            }
            else
            {
                break;
            }
        }
        if (isReverse)
        {
            return ReverseString(builder.ToString());
        }
        return builder.ToString();
    }

    public static string ReverseString(string s)
    {
        char[] arr = s.ToCharArray();
        Array.Reverse(arr);
        return new string(arr);
    }