How do I extract a string of text in c#

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i am having trouble splitting a string in c# have a string

start and dffdfdddddddfd<m>one</m><m>two</m><m>three</m><m>four</m>dbfjnbjvbnvbnjvbnv and end

and I want to extract the text between <m> and </m> and i need 3 output :

output 1 : one two three four

output 2 : four

output 3 : one

what do i do ?
how would I do this?
please give me a sample code
please help.
thanks and regards.

Posted 8-Oct-11 20:21pm

mehrdad1991h

Updated 8-Oct-11 20:33pm

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OriginalGriff · Accepted Answer · 2011-10-08T20:40:00

Use a Regex:

(?<=\<m\>)[^\<]+(?=\)

C#

//  using System.Text.RegularExpressions;

/// <summary>
///  Regular expression built for C# on: Sun, Oct 9, 2011, 07:37:07 AM
///  Using Expresso Version: 3.0.3634, http://www.ultrapico.com
///
///  A description of the regular expression:
///
///  Match a prefix but exclude it from the capture. [\<m\>]
///      \<m\>
///          Literal <
///          m
///          Literal >
///  Any character that is NOT in this class: [\<], one or more repetitions
///  Match a suffix but exclude it from the capture. [\</m\>]
///      \</m\>
///          Literal <
///          /m
///          Literal >
///
///
/// </summary>
public static Regex regex = new Regex("(?<=\\<m\\>)[^\\<]+(?=\\</m\\>)",
    RegexOptions.CultureInvariant | RegexOptions.Compiled);

// Capture all Matches in the InputText
MatchCollection ms = regex.Matches(InputText);

Get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions. I really wish I'd written it!

BillWoodruff · Accepted Answer · 2011-10-09T03:13:00

I am voting +5 for OriginalGriff's elegant solution above ... and you should too :) ... but ... I was curious to know the pain of implementing this using 'Split' so here goes:

C#

// this code uses Linq: be sure and reference the Linq library 
// in your Form's 'Using-declarations"' using System.Linq;
//
// assume a winform with:
// textBox1, textBox2, button1
// textBox1 (MulitLine = false) holds the string to be split
// textBox2 (MultiLine = true) will hold the result of splitting
// button1 triggers the parsing

// variables to hold the results of indexing the split string
private List<string> method1;
private string method2;
private string method3;

// string to be turned into char[] to use in splitting
private string stringForSplit = "<m>";

private void button1_Click(object sender, EventArgs e)
{
    var result = textBox1.Text
      .Split(stringForSplit.ToCharArray())
        .Where(s => (!String.IsNullOrWhiteSpace(s)))
          .ToList();

    // ignore the first and last entries in the result
    result = result.GetRange(1, result.Count - 2);

    method1 = result;
    method2 = result.Last();
    method3 = result.First();

    // examine the result ...
    textBox2.Lines = result.ToArray();
}

Discussion:

1. would be interesting to compare performance of Split versus RegEx for this scenario.

2. to really compare the 'generalized usefulness' of this technique compared to RegEx would require skills beyond my knowledge of RegEx.

How do I extract a string of text in c#

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