Use code to learn C # & amp;. NET -- delegate usage (Regular Expression replacement)

 

Code compiling and running environment Visual Studio 2010. NET v4.0.30319

 

 

Using System;

Using System. Collections. Generic;

Using System. Linq;

Using System. Text;

Using System. Text. RegularExpressions;

 

Namespace DelegateUseInRegexReplace

{

/// <Summary>

/// Sometimes, use a regular expression to replace part of the matching content in a string.

/// In this example, html source code conversion may occur, that is, you need to replace the domain name or IP address in the href attribute in the hyperlink.

/// In this example, replace the IP address 192.168.1.23 with 202.145.65.15.

/// The delegate MatchEvaluator in regular expression replacement matches a method with a Match parameter to return a string.

/// </Summary> www.2cto.com

Class Program

{

Static void Main (string [] args)

{

String html = "<br/> <a href = \" http: // 192.168.1.23/index.html \ "> 192.168.1.23/index.html </a> ";

Console. WriteLine ("original string :");

Console. WriteLine (html );

String htmlResult = Regex. Replace (html, "<a [^ <] *>", new MatchEvaluator (ReplaceIP ));

Console. WriteLine ("replaced string :");

Console. WriteLine (htmlResult );

}

 

Public static string ReplaceIP (Match match)

{

Return match. Value. Replace ("192.168.1.23", "202.145.65.15 ");

}

}

}

 

The running result is:

 

From gxmark's column