DotNetKicks.com - Stories tagged with RegEx

Handy Regular Expressions - Zip/Postal code validation for US and Cana

Fri, 26 Jun 2009 04:45:03 GMT

Handy Regular Expression Zip/Postal code validation for US and Canada in the same expression for common form validation.

Confirms that the entry matches a pattern defined by a regular express

Mon, 01 Jun 2009 08:33:26 GMT

Confirms that the entry matches a pattern defined by a regular expression

Pretty-Printing Exceptions

Sun, 31 May 2009 08:30:23 GMT

Here are some snippets you might find useful for pretty-printing exception stack traces (using the trace string rather than the StackTrace class). First, a regular expression to extract namespace, method name, argument and source details from a stack trace string...

Regular Expression Engine in C# (the Story)

Wed, 13 May 2009 09:36:58 GMT

A "long time ago", more precisely 3 years ago, I was studying Automata and Formal Languages which was a Computer Engineering discipline. At that time I was amazed by the new things I was learning such as NFAs, DFAs, FSMs and Regular Expressions. For the sake of my development I started searching for programming related material that could...

Regular Expression Engine in C# (the Story)

Wed, 13 May 2009 09:36:58 GMT

Regex Hero to the Rescue

Fri, 01 May 2009 06:16:14 GMT

From BucketSoft comes an online Silverlight regular expression tool utilizing the .NET regular expression engine. Features instantaneous highlighting of regular expression matches. It's a great way to test iterations of your .NET regular expressions quickly.

How .NET Regular Expressions Really Work

Mon, 16 Mar 2009 22:46:04 GMT

A very deep dive into the source code for how .NET Regular Expressions really work

Advanced Regular Expressions in C#

Thu, 12 Mar 2009 10:38:56 GMT

In this third and for now last post on using regular expressions we look at some advanced topics. When your expressions become more complicated they also become harder to understand so documenting them can help. And isn't standard string replacement a little bit too basic? We also look at how speeding things up can improve your code's efficiency.

Regular Expressions in C# - Practical Usage

Thu, 12 Mar 2009 20:31:47 GMT

This post touches on four major regular expression subjects: 1. String Comparison - does a string contain a particular sub-string? 2. Splitting a string into segments - we will take an IPv4 address and retrieve its dotted components 3. Replacement - modifying an input string 4. Stricter input validation - how to harden your expressions.

Matching Tags using Regular Expressions Balancing Groups

Thu, 19 Feb 2009 22:27:47 GMT

Matching Tags using Regular Expressions Balancing Groups from CraigW Blog

Inline Regular Expression Options

Fri, 02 Jan 2009 21:40:18 GMT

Did you know you can specify regular expression option inline inside the regular expression text? You can even have parts of one regular expression have different options!

One PowerShell Script to download PDC2008 Videos, Code and PowerPoints

Thu, 11 Dec 2008 01:46:08 GMT

Yes I did it. I downloaded all 65,563,667,714 bytes and saved them as 407 files on my nice new WD Passport hard drive that I brought home from the PDC2008. And, yes I did it the old fashioned manual way: Right-Click on link and Save-As. But you don't have to do it. In this blog post I provide the metadata of all the files I downloaded and a PowerShell script that will help you automating the download process. Besides the PDC content you also get to a treasure trove of PowerShell scripting techniques ranging from dynamically generating Regular Expressions to loading meta-data form XML and CSV files.

strfriend.com | A tool to visualize your regular expressions

Thu, 04 Dec 2008 18:09:50 GMT

You can visualize your regular expressions in this site. It's suitable for presentations and articles because a picture worth 1000 words!

HOWTO: Use Visual Studio Find and Replace to Conditionally Change Code

Tue, 02 Dec 2008 22:36:43 GMT

Writing Regular Expressions is a black art that is equally powerful and frustrating to master. Visual Studio's Search & Replace feature allows for using Regular Expression matching to perform complex replace operations. I'll show you how.

Artifcial Christmas Trees

Thu, 27 Nov 2008 11:07:33 GMT

These are the prettiest things I've seen in a long time.

Meta-Programming with PowerShell and Regular Expressions

Wed, 26 Nov 2008 23:29:37 GMT

I am almost done with my biggest PowerShell scripting project so far. The last feature that I implemented was a flexible pattern matching facility. I wrote a procedure that would try to filter out a set of file names based on the first letters and the extensions of the file. The possible name prefixes and extensions would be provided by string arrays that could contain zero or more elements. The challenge as always with PowerShell is to understand its type conversion magic. One approach to this is to use baby steps while morphing the static regex string to a dynamically built regex string. This progression and the result is captured in this blog post.

TryParseGuid - Try/Catch vs Regex

Tue, 25 Nov 2008 02:45:11 GMT

Need to TryParse a Guid? Guess which is faster: try/catch or Regex.Parse. The results may surprise you.

Extracting URLs, not perfect but "good enough"

Fri, 31 Oct 2008 01:52:32 GMT

Detecting URLs in text is harder than you would expect. In fact, it can't be done with a set of hard rules, but we can get very close by using a single .NET regular expression. Purists will protest, but what's wrong with "good enough"?

.NET Regular Expression Exclusion

Sat, 11 Oct 2008 10:27:20 GMT

Efficient exclusion of certain patterns using .NET Regex functionality. I.e. find all instances of "X" but ignore all instance of "X" if it's found inside of a Tag "<>".

The bare minimum every programmer should know about regular expression

Tue, 01 Jul 2008 16:46:18 GMT

Many programmers disregard regular expressions as line noise, and it's a damned shame because they come in handy so often. Once you've gotten the hang of them, regular expressions can be used to solve countless real world problems...

Regular Expressions: Now You Have Two Problems

Sat, 28 Jun 2008 03:37:09 GMT

If you've ever talked about regular expressions with another programmer, you've invariably heard this 1997 chestnut: 'Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.'

Regular Expression Visualizer-A Must Have Tool

Thu, 19 Jun 2008 11:48:52 GMT

A review and example of Roy Osherove's new Regular Expression Visualizer for Visual Studio.

RegEx to extract __VIEWSTATE from the Login page HttpWebRequest

Wed, 18 Jun 2008 19:10:23 GMT

Here is a quick one line code to extract __VIEWSTATE hidden form field from the ASP.NET Login page. This comes in handy during web automation of the ASP.NET form authentication.

Online regular expression tester with Help

Thu, 12 Jun 2008 23:06:46 GMT

Cool Online regular expression tester with Help

How to rename batches of files using .NET Regular Expressions

Wed, 11 Jun 2008 07:10:49 GMT

The tool that I am presenting here renames batches of files that have some kind of numerical index as part of their file name. It can rename the text before the index, it can shift the index numbers, give the files a new extension and add or remove leading zeros to and from the numerical index part of the file name. It uses Regular Extensions to parse the file names.