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, 19 Jun 2002
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Online spell checking using C# and regular expressions.


SpellCheck.NET is free online spell checking site. Whenever I need to check my spelling I visit this site, so I decided to write a parser for this site. I wrote this parser with C# and wrapped it up in a DLL file and called it Word.dll. In this article I will show you how to parse a HTML page using regular expressions. I will not explain all the source code since it is available for download. My main purpose of this project is to demonstrate how to parse a HTML page using regular expressions. 

Before this project I have never worked with regular expressions seriously, so I decided to use regular expressions. In this project I have learned a lot about C# regular expressions and .NET framework. The difficult part was in this project writing regular expressions pattern. So I referred to different sites and books to get the right pattern.

Here are some useful sites to check out.

About Word.dll

Word.dll has one public class and two public methods

  1. Public Class SpellCheck

       Include "using Word.dll" at the top of file for the object reference.

       SpellCheck word = new SpellCheck();
  2. Public Method CheckSpelling

    This method will check the word and return true or false. If the word is correct then it will return true otherwise false.

       bool status = false;
       status = word.CheckSpelling("a word");
  3. Public Method GetSpellingSuggestions

    This method will return the collection of suggested words.

     foreach(string suggestion in word.GetSpellingSuggestions("a word")) 
        System.Console.WriteLine( suggestion ); 

Parser Technique

  1. Connect to site and pass the word.
  2. Look for the word "correctly." in html file, if found return true
  3. else look for the word "misspelled.", if found return false.
    regular expression pattern @"(correctly.)|(misspelled.)"
  4. If the word misspelled found in html then look for the word "suggestions:"
    regular expression pattern  @"(suggestions:)"
  5. and parse the string between <blockquote>
    regular expression pattern  @"<blockquote>(?:\s*([^<]+) \s*)+ </blockquote>"
  6. and finally return the collection of suggested words.

C# code:

Source file is included in zip format for download.

Calling Word.dll wrapper class:

This is how you would call this wrapper class in your application.

using System;

using Word;

/// <summary>
/// Test Harness for SpellCheck Class
/// </summary>
class TestHarness
    /// <summary>
    /// testing Word Class
    /// </summary>
    static void Main(string[] args)
        SpellCheck word = new SpellCheck();

        bool status = false;
        string s = "youes";

        Console.WriteLine("Checking for word : " + s );
        // check to see if the word is not correct  
        // return the bool (true|false)
        status = word.CheckSpelling(s);

        if (status == false)
            Console.WriteLine("This word is misspelled : " + s);
            Console.WriteLine("Here are some suggestions");

            foreach( string suggestion in word.GetSpellingSuggestions(s) ) 
                System.Console.WriteLine( suggestion ); 
        else if (status == true)
            Console.WriteLine("This word is correct : " + s );



Run the "compile.bat" file at the DOS prompt, it will create necessary files.


This is how your screen would look like after you execute TestHarness.exe file.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Waheed Khan
Web Developer
United States United States
Currently working with C# and ASP.NET.

Comments and Discussions

Questionproblem with PinmemberPetr Semrád5-Jun-13 23:29 
GeneralOpen Office Spellchecker for .NET + Hyphenation + Thesaurus [modified] PinmemberThomas Maierhofer16-Nov-09 7:22 
GeneralRelated Dictionaries PinmemberVasudevan Deepak Kumar30-Jan-07 0:39 
GeneralDictionaries PinmemberFranck Quintana25-Oct-06 8:36 
GeneralRe: Dictionaries PinmemberVasudevan Deepak Kumar19-Mar-07 7:15 
GeneralRe: Dictionaries PinmemberFranck Quintana19-Mar-07 7:37 
QuestionCopyright? Pinmemberjmw17-Aug-06 9:33 
AnswerRe: Copyright? PinmemberVasudevan Deepak Kumar19-Mar-07 7:15 
GeneralDeveloping a spell checker Pinmembermad_68421-Jan-05 20:41 
Dear sir,
i've been asked to design a c# code for checking spellings in my project.Please give me some code on which i could work on.I've designed a code whose efficiency is quite less.Please help me out as soon as possible.
Thanking you,bye,have a nice day
madhur kapoor
GeneralRe: Developing a spell checker PinmemberVasudevan Deepak Kumar19-Mar-07 7:13 
Generalcheck existance of word.dll Pinsussbunny rabbit4-Feb-04 18:29 
GeneralRe: check existance of word.dll PinmemberVasudevan Deepak Kumar19-Mar-07 7:13 
GeneralWord.dll Pinmemberhalegua9-Mar-03 20:58 
GeneralRe: Word.dll PinmemberVasudevan Deepak Kumar19-Mar-07 7:14 
GeneralThe Google Version PinmemberBlake Coverett20-Jun-02 18:42 
GeneralRe: The Google Version PinmemberNick Parker23-Jun-02 18:39 
GeneralRe: The Google Version Pinmemberpareshgheewala30-Mar-05 0:06 
GeneralRe: The Google Version PinprotectorNick Parker30-Mar-05 2:52 
GeneralRe: The Google Version PinmemberVasudevan Deepak Kumar19-Mar-07 7:14 

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