C#

System.String or string

.Parse() // static

.==()

.+()

.Format() // static

object

.ToString()

string s = "..";

or
string s = new string("..");

string str1;

str1 = "..";

System.Text.RegularExpressions.Match

.Index

.Value

System.Text.RegularExpressions.MatchCollection

System.Text.RegularExpressions.Regex

.Matches() // static

using System;

using System.Text.RegularExpressions;

class CSTest

{

static void Main() {

string str = "김상형, 김상민, 김철수, 박상형, 김미형, 김철부지형, 김형, 김상형님 ";

MatchCollection Find = Regex.Matches(str, @"\b김\S+형\b");

foreach (Match M in Find) { ..M.Value .. }

}

}

System.Text.StringBuilder

.ToString()

.Append()

using System;
using System.Text;

class StringApp
{
    public static void Main()
    {
        StringApp obj = new StringApp();

        string str = "Class name is ";
        Console.WriteLine(str + obj);

        StringBuilder sb = new StringBuilder();

        sb.Append(str);
        sb.Append(obj);
        Console.WriteLine(sb);
    }
}