Getting Started with Regular Expressions 

- HtmlAgilityPack
- Fizzler
- CsQuery
- AngleSharp
- Regex 

The most important thing I learn in 2015 is that clean code is everything. You can have bad performance or logical errors or even security issues. 

But without clean code you cannot fix anything above, because you don't understand the code. 

Regex Cross­word 

Regulex : JavaScript Regular Expression Visualizer. 

جداکردن اعداد از داخل رشته

string[] digits = Regex.Split(sentence, @"\D+");

جدا کردن حروف از رشته

 string[] letters= Regex.Split(sentence, @"\d+");   

  Text Processing

  Using Regular Expressions in .NET

  Character Sets

  Quantifiers

  Anchors

  Alternation

  Searching Summary

  Regex Tester Program II

  Regex Objects

  Groups

  Look-Arounds

  Replacing Text with Regex

  Cleaning Data with Regular Expressions

  Unicode

  Optimizing Your Regex

  Regex Errors

  Other Regex Options

  Regex Summary

  Resources