Question

How to replace substring from specific character until first space in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "c# java c++ c", subs = "", replaces = "php";
            char ch = 'j';

            int start = s.IndexOf(ch);

            for (int i = start; i < s.Length; i++)
            {
                if (s[i] != ' ') 
                {
                    subs += s[i];
                }
                else
                {
                    break; 
                }
            }

            s = s.Replace(subs, replaces);

            Console.WriteLine(s);
        }
    }
}


/*
run:

c# php c++ c

*/

 

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Answer 2

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "c# java c++ c", replaces = "php";
            char ch = 'j';

            int start = s.IndexOf(ch);
            int end = s.IndexOf(' ', start);

            s = s.Replace(s.Substring(start, end - start), replaces);

            Console.WriteLine(s);
        }
    }
}


/*
run:

c# php c++ c

*/

 

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Answer 3

using System;
using System.Linq;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "c# java c++ c", replaces = "php";
            string ch = "j";

            str = string.Join(" ", str.Split().Select(s => s.StartsWith(ch) ? replaces : s));

            Console.WriteLine(str);
        }
    }
}


/*
run:

c# php c++ c

*/

 

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