Match exact string

Question

I´m trying to run this code that uses a string(ing) and a string array (splitwords).
I need to run all the string(ing) and if it matches the string from the string array does something with that original string.
Code:
StringBuilder builder = newStringBuilder();
ing = " " + ing + " ";
builder.Append(@"{\rtf1\ansi");
foreach (string word in splitwords)
if (Regex.IsMatch(ing, @"(?<![\w])" + word + @"(?![\w])"))
// for example put the word in UPPERCASE
builder.Append(ing);
builder.Append(@"}");
return builder.ToString();
With all the tests it runs ok, but if the word (in the splitwords) to match is "leite" and in the text it has the word "I need to run the string with the word leitelho in it"
he thinks it  matches the word "leite".
It returns "I need to run the string with the word LEITE lho in it"
How can I change my if condition to solve this problem?

Answer 1

Hi Leonor, 
This following line is incomplete;
ing = " " + ing + " ";
Try the following code, it COMPILES and runs in Visual Studio just fine. BTW, if the split function is to work, you need to
add a space between the words leite and
lho. What does this phrase mean???
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace MatchExactString
class Program
static void Main(string[] args)
//Console.WriteLine("enter words seperated by space");
//string[] ArrayOfWords = Console.ReadLine().Split(' ');
String WordPhrase = "I need to run the string with the word leite << SPACE HERE >>lho in it";
string[] ArrayOfWords = WordPhrase.Split(' ');
String x = ReturnString(ArrayOfWords); Console.Writeline(x);
static string ReturnString(string[] someWords)
StringBuilder builder = new StringBuilder();
string ing = "leite";
string[] splitwords = someWords;
ing = " " + ing + " ";
builder.Append(@"{\rtf1\ansi");
foreach (string word in splitwords)
if (Regex.IsMatch(ing, @"(?<![\w])" + word + @"(?![\w])"))
// for example put the word in UPPERCASE
ing = word.ToUpper();
//builder.Append(ing);
//builder.Append(@"}");
}//end foreach
builder.Append(ing);
builder.Append(@"}");
return builder.ToString();
Noticed I have commented out the following lines;
builder.Append(... ;
Are you trying to return a JSON string ???
UML, then code