Regular Expresion Part : Regular Expression « Regular Expression « C# / CSharp Tutorial

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C# / CSharp Tutorial » Regular Expression » Regular Expression 
17.1.4.Regular Expresion Part
using System;
using System.Text;
using System.Text.RegularExpressions;

public class MainClass
{
    static void Mainstring[] args ) {
        // Create regex to search for IP address pattern.
        string pattern = @"(?<part1>[01]?\d\d?|2[0-4]\d|25[0-5])\." +
                         @"(?<part2>[01]?\d\d?|2[0-4]\d|25[0-5])\." +
                         @"(?<part3>[01]?\d\d?|2[0-4]\d|25[0-5])\." +
                         @"(?<part4>[01]?\d\d?|2[0-4]\d|25[0-5])";
        Regex regex = new Regexpattern );
        Match match = regex.Match"192.1.1.122" );

        MatchEvaluator eval = new MatchEvaluator(IPReverse );
        Console.WriteLineregex.Replace("192.1.1.122", eval) );
    }

    static string IPReverseMatch match ) {
        StringBuilder sb = new StringBuilder();
        sb.Appendmatch.Groups["part4""." );
        sb.Appendmatch.Groups["part3""." );
        sb.Appendmatch.Groups["part2""." );
        sb.Appendmatch.Groups["part1"] );
        return sb.ToString();
    }
}
122.1.1.192
17.1.Regular Expression
17.1.1.Use Regular Expressions to split string
17.1.2.Do a replace using the Regex
17.1.3.Reverse
17.1.4.Regular Expresion Part
17.1.5.new Regex('^\\d+') 1
17.1.6.new Regex('\d+$') 2
17.1.7.new Regex('^\\d+$') 3
17.1.8.new Regex('(abc)|(xyz)*') 1
17.1.9.new Regex('((abc)|(xyz))*') 2
17.1.10.new Regex('((?:abc)|(?:xyz))*') 3
17.1.11.new Regex(?(^\d)^\d+$|^\D+$)
17.1.12.new Regex((abc)*)x(\1)
17.1.13.new Regex(^\d+$\n+, RegexOptions.Multiline)
17.1.14.new Regex((abc)*abc((abcd)|z)bc)
17.1.15.new Regex(<[^>]+>[^<]*]+>): for XML tag
17.1.16.new Regex(<([^>]+)>[^<]*: for XML tag
17.1.17.Using RegEx
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