We have a string STR = “Welcome to Programming world.” Can you write a program to find out number of ‘r’ char count without using for loop ?

string str = "Welcome to Programming World"; int result = str.ToCharArray().Count(c => c == 'r');

string str = "Welcome to programming world"; int charcount3 = str.Length - str.Replace("r", string.Empty).Length; Console.WriteLine(charcount3);

Both the answers posted below are correct. using System; using System.Linq; using System.Text.RegularExpressions; namespace DemoConsoleApp { class Program { static void Main(string[] args) { string str = "Welcome to programming world"; int count = Regex.Matches(str, "r").Count; Console.WriteLine(count); var charCount = str.ToCharArray().Where(item => item.ToString().ToLower() == "r").Count(); Console.WriteLine(charCount); Console.ReadKey(); } } }

int count=Regex.Matches(STR, "r").Count;

Try this string _str = "Welcome to PRogramming world"; var charCount = _str.ToCharArray().Where(item => item.ToString().ToLower() == "r").Count();