how to highlight the exact match keyword in C#.net

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Hi
we are doing text search and highlight the keyword.

up to this working good.

I used the following code:-

if (Regex.IsMatch(retext, string.Format(@"\b{0}\b";, str, RegexOptions.Singleline)) == true)

{
  Label3.Text = retext.Replace(str, string.Format("<span style="font-weight">

bold;background-color:yellow ;'> {0,1}</span>", str));
                                   

 string strdis = retext.Replace(str, string.Format("", str), RegexOptions.Singleline| 

RegexOptions.IgnoreCase);
                                    
retext = Label3.Text;
                              

}

But the problem is when iam highlight the search keyword,it is highlight the exact keyword also highlight the related sub matching words.

Example:-
Iam searching the keyword "net" but it highlight the words "net" and "nunet" and "netherlands".

When iam searching the keyword with "net" it has to highlight the only "net" in my text.
Please guide me

Thanks in Advance.

Posted 22-Jun-11 1:33am

Member 7932936

Updated 22-Jun-11 1:35am

Ramalinga Koushik

v2

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[no name] 22-Jun-11 7:36am

Edited for code block.

4 solutions

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Prerak Patel · Answer 1 · 2011-06-22T01:54:00

Solution 4

I think \b is enough to get it as word only.
Try

retext = retext.Replace(str, String.Format("\b{0}\b",str), String.Format("<span style="font-weight:bold;background-color:yellow ;">{0,1}</span>", str))

Posted 22-Jun-11 1:54am

Prerak Patel

Updated 22-Jun-11 2:44am

v3

Comments

Member 7932936 22-Jun-11 8:05am

where i have to put \b

Prerak Patel 22-Jun-11 8:43am

I guessed that you used \b{0}\b for constructor too. Anyways, modified.

Manfred Rudolf Bihy 22-Jun-11 10:52am

Good one! 5+

SanjeevSingh · Answer 2 · 2011-06-22T01:50:00

Solution 2

Check this link
It might help you

http://stackoverflow.com/questions/3414556/regular-expression-to-match-exact-word-search-string-highlight[^]

sanjeev

Posted 22-Jun-11 1:50am

SanjeevSingh

RakeshMeena · Answer 3 · 2011-06-22T01:48:00

Solution 1

Try this pattern for Regex: "\<net\>".

Posted 22-Jun-11 1:48am

RakeshMeena

v2

Tarun Mangukiya · Answer 4 · 2011-06-22T01:51:00

Just use " " + str + " " in place of str so that the 'str' only with space is replaced.

You have to use the code like this:

XML

if (Regex.IsMatch(retext, string.Format(@"\b{0}\b";, str, RegexOptions.Singleline)) == true)
{
  Label3.Text = retext.Replace(" " + str + " ", string.Format("<span style="font-weight">
bold;background-color:yellow ;'> {0,1}</span>", " " + str + " "));

 string strdis = retext.Replace(" " + str + " ", string.Format("", " " + str + " "), RegexOptions.Singleline
RegexOptions.IgnoreCase);
retext = Label3.Text;

}

Thanks