How to replace second occurrence of string in c# ?

Question

1.00/5 (1 vote)

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I want to replace second occurrence of Sub string in my main string with particular pattern using Regex.Replace() Method.

Ex.

HTML

<table>
<tr>
<td></td>
</tr>
</table>
 
<table>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>

I have above string with two table tags. I want replace second occurrence of table tag

HTML

<table>

with

HTML

<table id="mytable1">

.
How can i replace only second occurrence of table with my pattern. ?

Posted 29-Oct-15 1:23am

Veeshal Mali

Updated 29-Oct-15 1:25am

v4

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3 solutions

Solution 1

You can use it

C#

public string Replace2ndOccurence(string inputStr, string valueToReplace2ndOccurance)
   {
       Match m = Regex.Match(inputStr, "((" + Regex.Escape(valueToReplace2ndOccurance) + ").*?){2}");
       int index = 0;
       if (m.Success)
           index = m.Groups[2].Captures[1].Index;
       return inputStr.Remove(index, valueToReplace2ndOccurance.Length);
   }

Posted 29-Oct-15 1:38am

PANKAJMAURYA

Comments

[no name] 29-Oct-15 7:52am

did it Solved your problem ?

Veeshal Mali 31-Oct-15 2:47am

No not yet....
its not replacing any string belongs to my string.

[no name] 31-Oct-15 3:02am

Its working on your posted string also on our end. Can you please post your string on which its not working?

Veeshal Mali 31-Oct-15 3:05am

No pankaj sir... Your solution doesn't solve my problem... Please give me best solution sir....

[no name] 31-Oct-15 3:13am

Can you please post your test string ?

Veeshal Mali 31-Oct-15 3:15am

<table><tr><td></td><td>2015-10-30 21:00:43 GMT</td></tr></table></div><table><tr><td>Symbol</td><td>Last</td><td>5 Minutes</td><td>15 Minutes</td><td>Hourly</td><td>Daily</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">EUR/USD</td><td><span class="ftqa11bbb" style="color:#d80100;">1.1004</td><td>Buy</td><td>Neutral</td><td>Strong Sell</td><td>Strong Sell</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">GBP/USD</td><td><span class="ftqa11bbb" style="color:#05a007;">1.5427</td><td>Strong Buy</td><td>Neutral</td><td>Strong Buy</td><td>Buy</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">USD/JPY</td><td><span class="ftqa11bbb" style="color:#d80100;">120.62</td><td>Strong Sell</td><td>Strong Sell</td><td>Sell</td><td>Neutral</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">USD/CHF</td><td><span class="ftqa11bbb" style="color:#05a007;">0.9880</td><td>Neutral</td><td>Neutral</td><td>Neutral</td><td>Strong Buy</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">AUD/USD</td><td><span class="ftqa11bbb" style="color:#757575;">0.7136</td><td>Strong Buy</td><td>Strong Buy</td><td>Strong Buy</td><td>Strong Sell</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">EUR/GBP</td><td><span class="ftqa11bbb" style="color:#d80100;">0.7136</td><td>Strong Buy</td><td>Neutral</td><td>Strong Sell</td><td>Strong Sell</td></tr></tbody></table>

Veeshal Mali 31-Oct-15 3:16am

sir this the string in which I want to replace the second table <table> with <table id="myDataTable">

[no name] 31-Oct-15 3:38am

You can try solution 3 .

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Tomas Takac · Accepted Answer · 2015-10-29T01:42:00

Solution 2

Maybe you can use XML instead of Regex:

C#

var doc = XDocument.Parse(@"<root><table>
<tr>
<td></td>
</tr>
</table>
 
<table>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table></root>");

var secondTable = doc.Root.Elements("table").Skip(1).First();
secondTable.SetAttributeValue("id", "mytable1");

var replaced = doc.ToString();

Posted 29-Oct-15 1:42am

Tomas Takac

Comments

Maciej Los 29-Oct-15 8:14am

Very interesting solution, my 5!

Sergey Alexandrovich Kryukov 29-Oct-15 11:16am

Indeed, why using Regex on XML? A 5.
—SA

PANKAJMAURYA · Accepted Answer · 2015-10-30T21:37:00

Solution 3

Use this solution to replace the string

C#

public string Replace2ndOccurence(string inputStr, string valueToReplace2ndOccurance,string newString)
   {
       Match m = Regex.Match(inputStr, "((" + Regex.Escape(valueToReplace2ndOccurance) + ").*?){2}");
       int index = 0;
       if (m.Success)
           index = m.Groups[2].Captures[1].Index;
       inputStr = inputStr.Remove(index, valueToReplace2ndOccurance.Length);
       return inputStr.Insert(index, newString);
   }

Posted 30-Oct-15 21:37pm

PANKAJMAURYA

Comments

Veeshal Mali 31-Oct-15 4:38am

thank you sir...
its working....

Veeshal Mali 31-Oct-15 4:39am

Sir Have a one more query...
Please give me a solution...
After Second table i have one div in which there is one paragraph... I want to remove this whole division after this table...

[no name] 31-Oct-15 4:44am

Can you please post your full string ?

Veeshal Mali 31-Oct-15 5:42am

<table><tr><td></td><td>2015-10-30 21:00:43 GMT</td></tr></table></div><table><tr><td>Symbol</td><td>Last</td><td>5 Minutes</td><td>15 Minutes</td><td>Hourly</td><td>Daily</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">EUR/USD</td><td><span class="ftqa11bbb" style="color:#d80100;">1.1004</td><td>Buy</td><td>Neutral</td><td>Strong Sell</td><td>Strong Sell</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">GBP/USD</td><td><span class="ftqa11bbb" style="color:#05a007;">1.5427</td><td>Strong Buy</td><td>Neutral</td><td>Strong Buy</td><td>Buy</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">USD/JPY</td><td><span class="ftqa11bbb" style="color:#d80100;">120.62</td><td>Strong Sell</td><td>Strong Sell</td><td>Sell</td><td>Neutral</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">USD/CHF</td><td><span class="ftqa11bbb" style="color:#05a007;">0.9880</td><td>Neutral</td><td>Neutral</td><td>Neutral</td><td>Strong Buy</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">AUD/USD</td><td><span class="ftqa11bbb" style="color:#757575;">0.7136</td><td>Strong Buy</td><td>Strong Buy</td><td>Strong Buy</td><td>Strong Sell</td></tr><tr><td><span class="ftqa11bb" style="color:#0059B0;">EUR/GBP</td><td><span class="ftqa11bbb" style="color:#d80100;">0.7136</td><td>Strong Buy</td><td>Neutral</td><td>Strong Sell</td><td>Strong Sell</td></tr></tbody></table>
<div>Fusion Media/Investing.com will not accept any liability for loss or damage as a result of reliance on the information contained within this tool including data, quotes, charts and buy/sell signals. Please be fully informed regarding the risks and costs associated with trading the financial markets, it is one of the riskiest investment forms possible. Currency trading on margin involves high risk, and is not suitable for all investors. Before deciding to trade foreign exchange or any other financial instrument you should carefully consider your investment objectives, level of experience, and risk appetite.</div>

After second there is a one div with some content. Now I want to remove this whole siv with content too. only keep this both tables.

[no name] 31-Oct-15 5:49am

You Can do that. Can you create a new question for that? i will give solution on that.

Veeshal Mali 31-Oct-15 7:42am

hello pankaj sir.. I have put the new question for this ... Please let me know the answer...

[no name] 31-Oct-15 9:41am

Can you please give URL of question ?

Veeshal Mali 4-Nov-15 22:43pm

Hello Pankaj sir.... This is the url where i put new question.
http://www.codeproject.com/Answers/1045446/How-to-remove-some-tags-or-strings-from-Main-strin#answer1