Regular Expression in C#

Essential Code to Use Regular Expression in C#

 using System;

using System.Text.RegularExpressions;

            Regex phoneExp = new Regex(@"^\(\d{3}\)\s\d{3}-\d{4}$");

            string input;

            Console.Write("Enter a phone number: ");

            input = Console.ReadLine();

            while (phoneExp.Match(input).Success == false)
            {

                Console.WriteLine("Invalid input. Try again.");

                Console.Write("Enter a phone number: ");

                input = Console.ReadLine();
            }

            Console.WriteLine("Validated!");
   

在[2]里还介绍了使用RE来进行replace和遍历匹配的字符串的代码.

 附

Regular Expression Single Character Classes

Class	Description
\d	Any digit
\D	Any nondigit
\w	Any word character
\W	Any nonword character
\s	Any whitespace character
\SW	Any nonwhitespace

 
Ranged and Set Character Classes

Format	Description
.	Any character except newline.
\p{uc}	Any character within the Unicode character category uc.
[abcxyz]	Any literal character in the set.
\P{uc}	Any character not within the Unicode character category uc.
[^abcxyz]	Any character not in the set of literal characters.

 
Character Class Quantifiers

Format	Description
*	0 or more characters
+	1 or more characters
?	0 or 1 characters
{n}	Exactly n characters
{n,}	At least n characters
{n,m}	At least n but no more than m characters

 
Positional (Atomic Zero-Width) Assertions

Format	Description
^	Beginning of a string or beginning of a newline
\z	End of the string, including the newline character
$	End of a string before a newline character or at the end of the line
\G	Continues where the last match left off
\A	Beginning of a string
\b	Between word boundaries (between alphanumeric and nonalphanumeric characters)
\Z	End of the string before the newline character
\B	Characters not between word boundaries

 
Reference
[1] http://www.codeproject.com/dotnet/regextutorial.asp
The 30 Minute Regex Tutorial (from codeproject) (用实例介绍书写正则表达式的技巧,并提供了一个非常好的工具Expresso(甚至可以帮你分析你写的正则表达式))

[2] http://www.codeproject.com/books/0672325802.asp

Strings and Regular Expressions (chapter 3 of Microsoft Visual C# .NET 2003 Developer's Cookbook) (C#中RE的基本知识,基本的使用代码)

[3] http://msdn2.microsoft.com/en-us/library/system.text.regularexpressions.aspx

System.Text.RegularExpressions Namespace (.net framework中正则表达式有关的类,如Regex, Match,RegexOptions等)

[4] http://www.ultrapico.com/

download the latest Expresso (an easy tool to learn regular expression)

 [5] http://msdn2.microsoft.com/en-US/library/hs600312.aspx

.NET Framework Regular Expressions(有很多实用的例子)