Regular Expressions for C #

usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.IO;usingSystem.Reflection;usingSystem.Text.RegularExpressions;namespacecodetest{classProgram {Static voidMain (string[] args) {            string[] Strarray = {"1111-222-333","1111-2222-3333" }; stringPattern =@"^\d{4}-\d{3}-\d{3}$"; foreach(varIteminchStrarray) {                if(Regex.IsMatch (item, pattern)) {Console.WriteLine ("{0} is vaild", item); }                Else{Console.WriteLine ("{0} is not vaild", item);            }} regexismacth ();            Regexreplace ();            Regexsplit ();            Regexmacths ();            Regexgroup ();        Console.ReadLine (); }        Static voidregexismacth () {stringinput ="This is my name my name"; stringPattern =@"\s\w{4}\s"; Match Match=Regex.match (Input,pattern);  while(match. Success) {Console.WriteLine (match. groups[0].                Value); Match=match.            NextMatch (); }        }        Static voidRegexreplace () {stringinput ="This is my name my name"; stringPattern =@"\s\w{4}\s"; stringReplacement ="Match";            Console.WriteLine (input);        Console.WriteLine (Regex.Replace (input, pattern, replacement)); }        Static voidRegexsplit () {stringinput ="1.A 2.B 3.C 4.D"; stringPattern =@"\s"; foreach(varIteminchRegex.Split (Input,pattern)) {                if(!string.                IsNullOrEmpty (item)) {Console.WriteLine (item); }            }        }        Static voidregexmacths () {regex regex=NewRegex (@"\d+");            MatchCollection matchs; Matchs= Regex. Matches ("123abc333adsa123123asdasd123123"); foreach(Match Iteminchmatchs) {Console.WriteLine ("value is {0},index is {1}", item. Value,item.                Index); Console.WriteLine ("Result is {0}", item. Result ("[$&]")); }        }        Static voidRegexgroup () {stringinput ="Born:july, 1989"; stringPattern =@"\b (\w+) \s (\d{1,2}), \s (\d{4}) \b"; Match Match=Regex.match (input, pattern);  for(inti =0; I < match. Groups.count; i++) {Console.WriteLine ("Group value is {0},index is {1}", match. Groups[i]. Value,match. Groups[i].            Index); }        }    }}

Recommended use of Microsoft's regular Expression tester tool test

Regular Expressions for C #