CODEWITHSUNDEEP
c#
Daniel Cheung
Daniel Cheung

Reputation: 4819

Search for a sub-string within a string

I am really a beginner, I already know 

string.indexOf("");

Can search for a whole word, but when I tried to search for e.g: ig out of pig, it doesn't work.

I have a similar string here(part of):

<Special!>The moon is crashing to the Earth!</Special!>

Because I have a lot of these in my file and I just cannot edited all of them and add a space like:

< Special! > The moon is crashing to the Earth! </ Special! >

I need to get the sub-string of Special! and The moon is crashing to the Earth! What is the simple way to search for a part of a word without adding plugins like HTMLAgilityPack?

Upvotes: 0

Views: 123

Answers (4)

prospector
prospector

Reputation: 3469

   string page = "<Special!>The moon is crashing to the Earth!</Special!>";
        if (page.Contains("</Special!>"))
        {
            pos = page.IndexOf("<Special!>");
            propertyAddress = page.Substring(10, page.IndexOf("</Special!>")-11);
            //i used 10 because <special!> is 10 chars, i used 11 because </special!> is 11
        }

This will give you "the moon is crashing to the earth!"

Upvotes: 0

Kamil
Kamil

Reputation: 13931

Please try this:

string s = "<Special!>The moon is crashing to the Earth!</Special!>";
int whereMyStringStarts = s.IndexOf("moon is crashing");

IndexOf should work with spaces too, but maybe you have new line or tab characters, not spaces?

Sometimes case-sensitivity is important. You may control it by additional parameter called comparisonType. Example:

 int whereMyStringStarts = s.IndexOf("Special", StringComparison.OrdinalIgnoreCase);

More information about IndexOf: String.IndexOf Method at MSDN

Anyway, I think you may need regular expressions to create better parser. IndexOf is very primitive method and you may stuck in big mess of code.

Upvotes: 0

keithwarren7
keithwarren7

Reputation: 14280

IndexOf will work, you are probably just using it improperly.

If your string is in a variable call mystring you would say mystring.IndexOf and then pass in the string you are looking for.

string mystring = "somestring";
int position = mystring.IndexOf("st");

Upvotes: 1

BrunoLM
BrunoLM

Reputation: 100331

How are you using it? You should use like this:

string test = "pig";
int result = test.IndexOf("ig");
// result = 1

If you want to make it case insensitive use

string test = "PIG";
int result = test.IndexOf("ig", StringComparison.InvariantCultureIgnoreCase);
// result = 1

Upvotes: 0

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