CODEWITHSUNDEEP
c#string
TheGateKeeper
TheGateKeeper

Reputation: 4520

Extract part of a string between point A and B

I am trying to extract something from an email. The general format of the email will always be:

blablablablabllabla hello my friend.

[what I want]

Goodbye my friend blablablabla

Now I did:

                    string.LastIndexOf("hello my friend");
                    string.IndexOf("Goodbye my friend");

This will give me a point before it starts, and a point after it starts. What method can I use for this? I found:

String.Substring(Int32, Int32)

But this only takes the start position.

What can I use?

Upvotes: 24

Views: 105283

Answers (6)

jeet chheda
jeet chheda

Reputation: 11

You guys.. You only need to create a new Function by yourself. Here, Use my code.

public string subsequence(string s, int start, int end) {
       string startstring = s.Substring(start);
       string endstring = s.Substring(end);
       startstring = startstring.Replace(endstring, "");
       return startstring;
}

Upvotes: 0

pravi.net
pravi.net

Reputation: 11

string s1 = "find a string between within a lengthy string";
string s2 = s1.IndexOf("between").ToString();
string output = s1.Substring(0, int.Parse(s2));
Console.WriteLine("string before between is : {0}", output);
Console.ReadKey();

Upvotes: 1

Rune FS
Rune FS

Reputation: 21742

You can simply calculate the length from the start and end

const string startText = "hello my friend";
var start = str.LastIndexOf(startText) + startText.Length;
var end = str.IndexOf("Goodbye my friend");
var length = end -start;
str.Substring(start,length);

Upvotes: 3

Eric J.
Eric J.

Reputation: 150108

Substring takes the start index (zero-based) and the number of characters you want to copy.

You'll need to do some math, like this:

string email = "Bla bla hello my friend THIS IS THE STUFF I WANTGoodbye my friend";
int startPos = email.LastIndexOf("hello my friend") + "hello my friend".Length + 1;
int length = email.IndexOf("Goodbye my friend") - startPos;
string sub = email.Substring(startPos, length);

You probably want to put the string constants in a const string.

Upvotes: 34

L.B
L.B

Reputation: 116108

you can also use Regex

string s =  Regex.Match(yourinput,
                        @"hello my friend(.+)Goodbye my friend", 
                        RegexOptions.Singleline)
            .Groups[1].Value;

Upvotes: 14

Alexander Corwin
Alexander Corwin

Reputation: 1157

try myStr.substring(start,end);

Upvotes: -3

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