Using Regular Expressions with .NET - C# and Visual Basic. The Microsoft .NET Framework, which you can use with any .NET programming language such as C# (C sharp) or Visual Basic.NET, has solid support for regular expressions.
The documentation of the regular expression classes is very poor, however. Read on to learn how to use regular expressions in your .NET applications. In the text below, I will use VB.NET syntax to explain the various classes. After the text, you will find a complete application written in C# to illustrate how to use regular expressions in great detail. I recommend that you download the source code, read the source code and play with the application.
.NET Framework Regular Expressions. Regular expressions provide a powerful, flexible, and efficient method for processing text.
The extensive pattern-matching notation of regular expressions enables you to quickly parse large amounts of text to find specific character patterns; to validate text to ensure that it matches a predefined pattern (such as an e-mail address); to extract, edit, replace, or delete text substrings; and to add the extracted strings to a collection in order to generate a report. Regular Expressions in ASP.NET. A Crash Course Steven A.
Smith March 2004. Regular Expressions Usage in C# Description The source code shows how to use Regular Expressions in C#.
The code Functions written for Validation Alphabet, AlphaNumeric, Integer, Postive Integer, Floating point numbers. You just cut copy these functions and use in any program. Explanation of Regular Expressions: Regular expressions are used to search specified in the source string. Examples: Pattern#1Regex objNotNaturalPattern=new Regex("[^0-9]"); Pattern#2 Regex objNaturalPattern=new Regex("0*[1-9][0-9]*"); Pattern#1 will match for strings other than 0 to 9.^ symbol is used for Specifying not condition.[] brackets if we are to give range values such as 0 - 9 or a-z or A-Z eg. abc will return true 123 will return false. 0-9's Eg. 0007 returns true whereas 00 will return false.
Basic things to be understood in RegEx: "*" matches 0 or more patterns"? " Regular Expression Cheat Sheet (.NET Framework) Learn Regular Expression (Regex) syntax with C# and .NET - Rad Software. Regular Expression (Regex) Design and Test Tool for .NET - Rad Software. Rad Software Regular Expression Designer is a free download that helps programmers learn, develop and test Regular Expressions. It is an interactive Windows application that is designed to be simple and easy to use. Features The Regex match results are listed in a tree with levels for Matches, Groups and Captures. Clicking on a Match, Group or Capture will highlight it in the Input text window Regex.Replace is supported and the results of the replace are listed in a separate window. The Language Element window is an embedded reference that gets you up to speed quickly. .NET Framework 1.1/2.0 Required The Regular Expression Designer is requires the .NET Framework to be installed before it will run.
Download Download Rad Software Regular Expression Designer v1.4 (~209 KB) If you have found the Regular Expression Designer useful and you would like to make a donation please use this PayPal button. The Regex Designer is free and there is no obligation to donate :-) Expresso Regular Expression Tool. The 30 Minute Regex Tutorial. Expresso 2.1C - 328 Kb Learning .NET Regular Expressions with Expresso Did you ever wonder what Regular Expressions are all about and want to gain a basic understanding quickly?
My goal is to get you up and running with a basic understanding of regular expressions within 30 minutes. The reality is that regular expressions aren't as complex as they look. The best way to learn is to start writing and experimenting. What the Heck is a Regular Expression Anyway? I'm sure you are familiar with the use of "wildcard" characters for pattern matching. In writing programs or web pages that manipulate text, it is frequently necessary to locate strings that match complex patterns.
A good way to learn the arcane syntax of regular expressions is by starting with examples and then experimenting with your own creations. Let's get started! Some Simple Examples Searching for Elvis Suppose you spend all your free time scanning documents looking for evidence that Elvis is still alive.