using System;
using System.Text.RegularExpressions;
namespace ConsoleApplication_C_Sharp
{
static class Program
{
static void Main()
{
string s = "java jar vb ja jaa j a jjb";
MatchCollection matchcollection = Regex.Matches(s, "j\\w+a");
foreach (Match mc in matchcollection) {
foreach (Capture subs in mc.Captures) {
Console.WriteLine("{0} : {1}", subs.Index, subs.Value);
}
}
}
}
}
/*
run:
0 : java
15 : jaa
*/