remove last words in textbox in C#.net

Question

3.40/5 (5 votes)

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Hi i want to remove last words in my textbox.
we are doing the application for resume search.
If my search string(textbox) contains .net and asp.net and and and and.....
Then I want to remove last "ands" and search is to done like ".net and asp.net" only.
How can i remove last words

I used substring and trimend.but it removes only one last "and"

Posted 29-May-11 19:35pm

Member 7932936

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Comments

Sergey Alexandrovich Kryukov 30-May-11 1:39am

How about not writing all those end end end? :-)
If you can remove one "end", why the rest of them is a problem?
--SA

Member 7932936 30-May-11 1:47am

it removes only last "and".fine.But the error shows like index was outside the bounds of an array

parmar_punit 31-May-11 3:14am

Hi Member 7932936
check my updated solution.. now it works fine

10 solutions

Solution 3

Use regular expression string: and$

string query = Regex.Replace(".net and asp.net and", @"and$", string.Empty, RegexOptions.IgnoreCase | RegexOptions.Singleline);

Output will be:

".net and asp.net "

Or replace regular expression string to \w+$, this will find the last word in a string.

If u want to remove only last "and" then you could use this

<pre lang="cs">string s = @".net and asp.net and" ;
string output = s.TrimEnd("and");

Posted 29-May-11 20:04pm

Kiran Sonawane

Updated 29-May-11 20:05pm

v2

Comments

Member 7932936 30-May-11 2:28am

if my string is like ".net and asp.net and and and and and".It is not working.
It is working only for ".net and asp.net and" .

Sergey Alexandrovich Kryukov 31-May-11 0:11am

You can probably modify it to work. And my algorithm certainly works.
--SA

Solution 1

Well remove them using string.TrimEnd until you're done. The criteria is that the last trim does not change the length of the stream — it means nothing was trimmed, so you're done.

See:

C#

static string TrimRightWord(string src, string toTrim) {
    if (src.EndsWith(toTrim))
        return src.Substring(0, src.Length - toTrim.Length);
    return src;
}

static string TrimEnds(string src, string wordToRemove) {
    char[] trimChars = new char[] {' '};
    int len;
    do {
        len = src.Length;
        src = src.TrimEnd(trimChars);
        src = TrimRightWord(src, wordToRemove);
        src = src.TrimEnd(trimChars);
    } while (len != src.Length);
    return src;
}

Better now?

—SA

Posted 29-May-11 19:40pm

Sergey Alexandrovich Kryukov

Updated 31-May-11 12:56pm

v4

Comments

[no name] 30-May-11 23:49pm

Hi SA,
This code will not remove all 'ands' at the end. this will remove only the last 'and'

Sergey Alexandrovich Kryukov 31-May-11 0:08am

Wrong. It will remove all of them. Trim by " " and "end" until not trimmed. What' so difficult?
--SA

yesotaso 31-May-11 7:20am

I cant imagine what downvoter was thinking :( apart from the typo there "end" => "and" it looks legit answer. Though I wouldn't use that logic and remove piece of input which may serve both "logical operator" and/or "the data itself", think of input "beast and beauty" the word "and" may serve both operator and input here. It might be better to construct eval tree from input text.

Sergey Alexandrovich Kryukov 31-May-11 19:01pm

It's not even a type. Who cares what word is that -- the code is abstracted from the word; OK, I replaced it with a parameter; thank you.
I don't discuss semantic of this code -- it makes no sense because the problem itself has no sense. To start with, those stupid repeated words should not be there. The whole idea indicate some bad approach, I don't even know the idea.
I feel sorry in most cases I try to answer any kind of stupid questions; when I simply explain why it's stupid, it is often accepted.
I violate my favorite principle: "don't be a problem solver". Better be not.
--SA

Monjurul Habib 31-May-11 19:07pm

i do agree with SA.my 5.

Sergey Alexandrovich Kryukov 31-May-11 20:05pm

Thank you, Monjurul.
--SA

Solution 5

VB

Dim result As String
   Dim stringToTrim As String = ".net and asp.net and and and and and"
   Private Sub MyMethod()
       TrimEnd(stringToTrim)
       MsgBox(result)
   End Sub
   Private Sub TrimEnd(ByVal input As String)
       If String.IsNullOrEmpty(result) Then
           Dim length = input.Trim.LastIndexOf(" and")
           If length + 4 = input.Trim.Length Then
               TrimEnd(input.Substring(0, length))
           Else
               result = input
           End If
       End If
   End Sub

The result will be .net and asp.net

Posted 30-May-11 19:03pm

Liju Sankar

Updated 31-May-11 0:57am

v2

Solution 6

VB

Dim result As String
   Dim stringToTrim As String = ".net and asp.net and and and and and"
   Private Sub MyMethod()
       TrimEnd(stringToTrim)
       MsgBox(result)
   End Sub
   Private Sub TrimEnd(ByVal input As String)
       If String.IsNullOrEmpty(result) Then
           Dim length = input.Trim.LastIndexOf(" and")
           If length + 4 = input.Trim.Length Then
               TrimEnd(input.Substring(0, length))
           Else
               result = input
           End If
       End If
   End Sub

The result will be .net and asp.net

Posted 30-May-11 19:04pm

Liju Sankar

Solution 8

to do such manipulation use a stringbuilder class

C#

StringBuilder inp = new StringBuilder();
               inp.Append( "asp.net and C# and Sqlserver and java and and and and");
             
               
               while (inp.ToString().Substring(inp.Length - 4, 4) == " and")
               {
                   inp.Replace(" and", "", inp.Length - 4, 4);
               }

Posted 30-May-11 21:35pm

Steven.Pinto2000

Solution 10

Here ya go...

Method to trim given text from the end of your string...

C#

private void TrimExcessTextFromEnd(ref string src, string text)
{
    if (src != null && src.Length >= text.Length && src.Contains(text))
    {
        src = src.Trim().TrimEnd(text.ToCharArray());

        while (src.Trim().EndsWith(text))
            TrimExcessTextFromEnd(ref src, text);
    }
}

... Test It ...

C#

string src = "c# and asp.net and and and and";
TrimExcessTextFromEnd(ref src, "and");
MessageBox.Show(src);

Posted 31-May-11 17:09pm

fcronin

Solution 11

You can try this

string str=".net and asp.net and";

Messagebox.show(str.Substring(0,str.LastIndexOf("and"));

Posted 31-May-11 20:07pm

Savalia Manoj M

Updated 31-May-11 20:08pm

v2

Solution 4

C#

string s=".net and asp.net and and and and and";
string output=s.Replace("and",String.Empty);

Posted 30-May-11 16:32pm

charles henington

Comments

yogiCsharp 30-May-11 23:51pm

This will remove all the ands and output will be ".net asp.net",
this is only the half work. We should add ands after this between every entity like
".net and asp.net"

Sergey Alexandrovich Kryukov 31-May-11 0:10am

Correct, it won't work, but my algorithm will.
--SA

Monjurul Habib 31-May-11 19:08pm

agree.

Solution 9

Hi,

Take the entire string and split it using the string.split function by giving the <space>and<space> as the splitter string this will ensure that the desired strings are in your array.iterate them and add all the strings to the result.
for example

string sSearchQuery = "asp.net and C# and SQL SERVER and ORACLE and and and and and";

string[] searchTerms = sSearchQuery.Split(" and ");
StringBuilder sbFinalSearchString =new StringBuilder();
for(int index = 1;index<searchterms.count;index++)>
{
      if(index!=1 && index!=searchterms.count)
       {
         sbFinalSearchString.Append(" and ");
       }
     sbFinalSearchString(searchTerms[index-1]);
}

This code has not been tested but please give it a try before working

Posted 31-May-11 0:54am

S@53K^S

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parmar_punit · Accepted Answer · 2011-05-29T20:00:00

Solution 2

C#

private string strcut(string str)
{
    string[] a = str.Trim().Split(' ');
    string str1 = string.Empty;
    for (int i = 0; i < a.Count() - 1; i++)
    {
        str1 = str1 + a[i];
        if (a.Count() - 2 != i)
        { str1 += " "; }
    }
    return str1;
}

C#

private void button1_Click(object sender, RoutedEventArgs e)
{
    string str = textBox1.Text;
    MessageBox.Show(strcut(str));
}

Posted 29-May-11 20:00pm

parmar_punit

Updated 30-May-11 21:12pm

v2

Comments

Member 7932936 30-May-11 2:34am

This code is not working.
this code is removing only spaces between the string.
But i want to remove last "and's" in my string

Sergey Alexandrovich Kryukov 31-May-11 0:11am

OP is right, my my algorithm will work, please see.
--SA