How would I count occurrences of a string within a string?

Question

4.60/5 (2 votes)

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I used the following code to find the matches string within a string.

C#

int x = Regex.Matches("I am good bad good bad bad boy", "bad").Count;

Here output x=3.

Now follow my problem.

C#

int x = Regex.Matches("I have a Voucher in AllVoucher", "Voucher").Count;

Here output x=2!

This program also count Voucher from AllVoucher. But I want to count Voucher where Voucher can start with anything(like -Voucher, .Vouchar) except letter. Like

C#

int x = Regex.Matches("I have a -Voucher in /Voucher", "Voucher").Count;

here expected output x=2;

But for the following line expected out is x=1;

C#

int x = Regex.Matches("I have a Voucher in AllVoucher", "Voucher").Count;

Here output x=2!

Please give me a solution using C#.NET. How can I count matches string where matches string can start with anything except letter.

Posted 18-Feb-15 21:16pm

sachi Dash

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2 solutions

Solution 2

string source = "I am good bad good bad bad boy";
int count = source.Count(f => f == 'bad');

Posted 18-Feb-15 21:53pm

manak chand

Updated 18-Feb-15 21:55pm

v2

Comments

CHill60 19-Feb-15 18:02pm

No. Produces compile error "Too many characters in character literal" and the intent does not address the problem given in the question with "I have a -Voucher in /Voucher" should return 2 but "I have a Voucher in AllVoucher" should return 1

manak chand 20-Feb-15 1:55am

Use double quote near bad...

string source = "I am good bad good bad bad boy";
int count = source.Count(f => f == "bad");

CHill60 20-Feb-15 4:29am

And that will produce the compile error "Operator '==' cannot be applied to operands of type 'char' and 'string'" and still does not address the problem as stated

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TheRealSteveJudge · Accepted Answer · 2015-02-18T21:42:00

Solution 1

C#

int CountWords(string input, string wordToFind)
{
    string pattern = string.Format(@"\b{0}\b", wordToFind);

    return Regex.Matches(input, pattern).Count;
}

You can call this method like this:

e.g.

C#

int count = CountWords("I have a -Voucher in /Voucher", "Voucher")

Posted 18-Feb-15 21:42pm

TheRealSteveJudge

Comments

sachi Dash 19-Feb-15 4:11am

Many Many Thanks !

TheRealSteveJudge 19-Feb-15 4:26am

You're welcome!

sachi Dash 10-Mar-15 9:23am

hello how are you? For the following
input:select rp_site.[user] as '[siteq1].[user_ip]'
wordToFind: rp_site.
here I get count=0; why ? please give me a solution. but rp_site. is here in input string. then why count get 0 instead of 1 ? please help me.

TheRealSteveJudge 10-Mar-15 10:24am

Thank you, I'm fine and you?
I just tried
MessageBox.Show(CountWords("input:select rp_site.[user] as '[siteq1].[user_ip]'", "rp_site").ToString());
It shows "1"