how to find a tabs and spaces in a string

Question

3.00/5 (1 vote)

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i have string
str="123 456";

between 3 and 4 there are spaces and tabs ,how can i decern
the spaces from tabs

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ques
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            pp();
        }

        private void pp()
        {
            int i,SumTab, SumSpace, len;
            string str;
            char[] characterArray = new char[250];

            str = "123       456";
            SumTab = 0;
            SumSpace = 0;
            len = str.Length;
            str.CopyTo(0, characterArray, 0, len);
            for (i = 0; i < str.Length; i++)
            {
                if (characterArray[i] == ' ') //Space
                    SumSpace++;
                else if (characterArray[i] == ' ')//?????
                    SumTab++;
                else ;
            }
        }
   }
}

Posted 18-Feb-11 5:29am

Khalid Sabtan

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Comments

Nish Nishant 18-Feb-11 12:55pm

Hey Khalid,

I noticed you marked a post as answer, and then unmarked it. I don't mind the unmarking, but are you still stuck on this?

6 solutions

Solution 2

C#

if (characterArray[i] == '\t')
   SumTab++;

Also, you might want to include the checks for '\n' (new line #10), '\r' (carriage return #13), '\b' (backspace, #8), Unicode characters in numeric forms, and more.

See: http://msdn.microsoft.com/en-us/library/aa691087(v=vs.71).aspx[^].

—SA

Posted 18-Feb-11 5:33am

Sergey Alexandrovich Kryukov

Updated 18-Feb-11 5:43am

v2

Solution 4

You can also use linq:

C#

public int CharCount(char character, string myString)
{
    int count = (from c in myString 
                 where c == character
                 select c).Count();
    return count;
}

And call it like this:

C#

int spaceCount = CharCount(' ', "123 456");
int tabCount   = CharCount('\t', "123 456");

Posted 18-Feb-11 5:35am

#realJSOP

Updated 18-Feb-11 5:38am

v2

Comments

Nish Nishant 18-Feb-11 11:40am

In this case this will take double the time though, since you loop twice. But if you only want to count one particular character, then this works (easier to maintain).

#realJSOP 18-Feb-11 11:55am

Code is more dynamic in its use, and when you get right down to it, the strings appear to be short. If it were me, I'd replace tabs with spaces, then replace multiple concurrent spaces with single spaces (accounting for stupid data entry clerks), and then count the spaces remaining. :)

Sergey Alexandrovich Kryukov 18-Feb-11 11:44am

Good, my 5, even though Nishant is probably right.
--SA

Solution 3

In addition to Nishant and SA's answers, you can find here a list of all special characters (or escape sequences):
http://msdn.microsoft.com/en-us/library/h21280bw.aspx[^]

Posted 18-Feb-11 5:34am

Olivier Levrey

Updated 18-Feb-11 5:36am

v2

Solution 5

You can also do it this way if you don't like (or can't use) LINQ:

C#

public int CharCount(char character, string myString)
{
    int count = 0;
    int pos = 0;
    do
    {
        pos = myString.IndexOf(character, pos);
        if (pos >= 0)
        {
            count++;
        }
    } while (pos >= 0);
    return count;
}

Posted 18-Feb-11 5:59am

#realJSOP

Updated 18-Feb-11 6:15am

v3

Comments

Nish Nishant 18-Feb-11 12:13pm

Missing while?

#realJSOP 18-Feb-11 12:15pm

Oops. :) Fixed.

Solution 6

If you trying to find the number of spaces and tabs quickly, with no worry for optimization, another way to do is, utilize the exiting method of String.Split[^]

String.Split will return an array of strings with the split strings based on your criteria, then you need to count your array size and your are done.

str = "123       456";
string [] split = str.Split(new Char [] {' '});
spaces = split.Length - 1

Posted 18-Feb-11 6:28am

Yusuf

Comments

#realJSOP 18-Feb-11 12:42pm

That requires twice the memory.

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Nish Nishant · Accepted Answer · 2011-02-18T05:31:00

Solution 1

\t is tab.

C#

if (characterArray[i] == ' ')
  SumSpace++;
else if (characterArray[i] == '\t')
  SumTab++;

Posted 18-Feb-11 5:31am

Nish Nishant

Updated 18-Feb-11 5:33am

v2

Comments

Sergey Alexandrovich Kryukov 18-Feb-11 11:46am

Yes, yes... a 5,
--SA

fjdiewornncalwe 18-Feb-11 14:31pm

Excellent. +5.

Espen Harlinn 19-Feb-11 12:52pm

Nice and simple, my 5