vb.net - How to find exact word from sentence -

in window application want find exact word sentence.the 2 field textbox(word) , richtextbox(sentence) respectively.

i've used str(i).contains(word) , each match match in regex.matches(str(i), word).

but these 2 not exact word.for example , word:ate sentence:parfaite ment aux exigences cre*ate* évolutives du marché d aujourd hui

in above fetches ate in create.but need focus onle ate not combined.

in regex.matches, need use \b word boundaries character. wrote example code in c#, , noticed question vb.net, i'll add both code examples:

c#:

        //example 1:         var teststring = "parfaite ment aux exigences create évolutives du marché d aujourd hui";         var pattern = "ate";         matchcollection found = regex.matches(teststring, @"\b" + pattern + @"\b");          if (found.count > 0)         {             foreach (match f in found)             {                 console.writeline("'{0}' found @ position {1} in given teststring.", f.value, f.index);             }         }         else console.writeline("no matches in given teststring.");           //example 2:         var teststring1 = "parfaite ment aux exigences cre*ate* évolutives du marché d aujourd hui don't know language this: ate , last 1 should found: ate!";         var pattern1 = "ate";         matchcollection found1 = regex.matches(teststring1, @"\b" + pattern1 + @"\b");          if (found1.count > 0)         {             foreach (match f in found1)             {                 console.writeline("'{0}' found @ position {1} in given teststring1.", f.value, f.index);             }         }         else console.writeline("no matches in given teststring1.");          console.readline(); 

vb.net:

    'example 1:     dim teststring = "parfaite ment aux exigences create évolutives du marché d aujourd hui"     dim pattern = "ate"     dim found matchcollection = regex.matches(teststring, "\b" & pattern & "\b")      if found.count > 0         each f in found             console.writeline("'{0}' found @ position {1} in given teststring.", f.value, f.index)         next     else         console.writeline("no matches in given teststring.")     end if      'example 2:     dim teststring1 = "parfaite ment aux exigences cre*ate* évolutives du marché d aujourd hui don't know language this: ate , last 1 should found: ate!"     dim pattern1 = "ate"     dim found1 matchcollection = regex.matches(teststring1, "\b" & pattern1 & "\b")      if (found1.count > 0)          each f match in found1             console.writeline("'{0}' found @ position {1} in given teststring1.", f.value, f.index)         next     else         console.writeline("no matches in given teststring1.")     end if      console.readline()