How to Replace specific word in given string. [Answered]RSS

• • Reply
  swaroopkumar...

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  How to Replace specific word in given string.

  Jul 25, 2014 06:57 AM|swaroopkumar1069|LINK

  Hi,

  I want to replace specific word in below given string. Please look out below small code.

  DataTable dtURLs = new DataTable();

  DataColumn s1 = new DataColumn("OldURL");

  dtURLs.Columns.Add(s1);

   

  DataRow row1 = dtURLs.NewRow();

  row1[s1] = "https://www.google.com";

  dtURLs.Rows.Add(row1);

   

  DataRow row2 = dtURLs.NewRow();

  row2[s1] = "https://www.google.com/services/";

  dtURLs.Rows.Add(row2);

   

  string campaignContent =

  @"https://www.google.com <br/> https://www.google.com/services/";

  string queryString = "queryString";

   

  foreach (DataRow dr in dtURLs.Rows)

  {

      string pattern = @String.Format(@"\b{0}\b", dr["OldURL"].ToString());

      campaignContent =

  Regex.Replace(campaignContent, pattern, dr["OldURL"].ToString() + "?" + queryString);

   

  }

   

  I am trying above the model but I got wrong output like below.

  OUTPUT:    

  https://www.google.com?queryString <br/> https://www.google.com?queryString /services/

  But I am excepted OUTPUT is like below.

  https://www.google.com?queryString <br/> https://www.google.com/services/?queryString

  Please give any solutions for above issue.

  C#.net

• • Reply
  vinay13mar

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:04 AM|vinay13mar|LINK

  For replacing specific work from a string you can use Replace function present in .net.

  plz check eg;

  string str="This is really new place.";
  string newstr=str.Replace("new","old");

  in above code we are replacing new word with old present in string

  http://msdn.microsoft.com/en-us/library/fk49wtc1(v=vs.110).aspx

  C#.net

  Thanks
  V.K.Singh
  
  
  
• • Reply
  smirnov

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:08 AM|smirnov|LINK

  Why not simply to add query string at the end?

  //string pattern = @String.Format(@"\b{0}\b", dr["OldURL"].ToString());
  //campaignContent = Regex.Replace(campaignContent, pattern, dr["OldURL"].ToString() + "?" + queryString);

  campaignContent = dr["OldURL"].ToString() + "?" + queryString;

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:15 AM|swaroopkumar1069|LINK

  Hi vinay,

  i know above replace function. I want specific word for example if your word having 'is' two times right?

  I want to replace 'is' word only in your sentence. U got my point.

  here output is like below.

  string newstr=str.Replace("are","is");

  Result: Thare are really new place.

  but i want below result.

  This are really new place.

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:26 AM|swaroopkumar1069|LINK

  HI Smirnov,

  Actually my requirement is i have one template, It having lot of Links. I want to add tags(Google analytic tags) to end of each and every link that why i maintain all links in DataTable then looping it and changing one by one. It is fine but in my template having two links like below.

  1. http://www.google.com

  2. http://www.google.com/service.

  I want to change only http://www.google.com to http://www.google.com?queryStirng don't disturb other links.

  C#.net

• • Reply
  smirnov

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:28 AM|smirnov|LINK

  swaroopkumar1069

  string newstr=str.Replace("are","is");

  Result: Thare are really new place.

  but i want below result.

  This are really new place.

  In this case you should use 

  string newstr=str.Replace("Thare","This");

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:39 AM|swaroopkumar1069|LINK

  @vinay & @smirnov 

  Thanks for reply here the brief explanation of my actual problem.

  Actually my requirement is I have one template with lot of links. I get all links in one DataTable. I am looping that DataTable and replace each every link with Google analytics tag which is given by my client.

  Here problem is in my template having two links like below.

  1. http://www.google.com
  2. http://www.google.com/services

  I want to replace “ http://www.google.com “  to “ http://www.google.com?ClientTags “  don’t disturb other links. My problem is while replacing 2^nd link also replaced I am getting result like below

  http://www.google.com?ClientTags  …… something matter …. http://www.google.com?ClientTags/Services

  I want to replace only 1^st link only. I want to replace specific word.

  C#.net

• • Reply
  smirnov

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 07:54 AM|smirnov|LINK

  Why not simply do like this?

  string search = "http://www.google.com";
  string replace = "http://www.google.com?ClientTags";
  int pos = text.IndexOf(search);
  if (pos != -1)
     text = text.Substring(0, pos) + replace + text.Substring(pos + search.Length);

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 08:56 AM|swaroopkumar1069|LINK

  Thanks for reply. It is working only when text contain one http://www.google.com working fine. But if your template having multiple http://www.google.com links above logic not working. For example like below.

  text =@"http://www.google.com <br/> http://www.google.com/services/ <br/> http://www.google.com";

  string search = "http://www.google.com";
  string replace = "http://www.google.com?ClientTags";
  int pos = text.IndexOf(search);
  if (pos != -1)
     text = text.Substring(0, pos) + replace + text.Substring(pos + search.Length);

  C#.net

• • Reply
  smirnov

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  Re: How to Replace specific word in given string.

  Jul 25, 2014 09:52 AM|smirnov|LINK

  First of all it is not clear why if you have all urls in the database you put them all in a string and then replace in that string. Instead you can do a loop through all rows and compare urls one by one.

  If this is not possible for some reasons then you can try 

  www.google.com(?![/\w])

  Complete example: https://dotnetfiddle.net/HJxYVQ

  Output: 

  http://www.google.com?newstring <br/> http://www.google.com/services/ <br/> http://www.google.com?newstring

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 26, 2014 01:16 AM|swaroopkumar1069|LINK

  Thank you very much smirov. Can you please given some reference site address of how to write above patterns.

  C#.net

• • Reply
  swaroopkumar...

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  Re: How to Replace specific word in given string.

  Jul 26, 2014 04:50 AM|swaroopkumar1069|LINK

  The above solution working fine. IF links having already parameters at that time above code not working. plz check below link.

  https://dotnetfiddle.net/h6YsnP

  http://www.google.com?newstring?UTM_Source=test This is wrong replacement. If Content links having with parameter  and with out parameters.

  C#.net

• • Reply
  smirnov

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  Re: How to Replace specific word in given string.

  Jul 26, 2014 06:41 AM|smirnov|LINK

  If http://www.google.com?UTM_Source=test should not be replaced then add ? in [ ]

  www.google.com(?![?/\w])

  
  
  

  C#.net