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Posted 30 Nov 2010

Visual Studio Add-in for testing regular expressions

, 1 Dec 2010 CPOL
An add-in for debugging and creating regular expression directly in Visual Studio
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using RegexTester.Parsing.CSharp;
using Microsoft.VisualBasic;
using System.Globalization;

namespace RegexTester.Parsing.VB
    public class VBRegexFormatProvider : BaseRegexFormatProvider
        private static Regex syntaxRegex;

        private string GetStringFromGroup(Group matchGroup, VBRegexFindResults results)
            if (matchGroup.Success)
                StringBuilder result = new StringBuilder();
                foreach (Capture capture in matchGroup.Captures)
                    string value = capture.Value;
                    result.Append(results.EditToDisplayString(value.Substring(1, value.Length - 2)));
                return result.ToString();
            return null;

        public override IRegexFindResults GetRegexFindResults(Match match)
            VBRegexFindResults results = new VBRegexFindResults();

            results.FoundMatch = match.Success;
            if (results.FoundMatch)
                results.ToMatch = GetStringFromGroup(match.Groups["tomatchstring"], results);
                if (match.Groups["tomatchnotstring"].Success)
                    results.ToMatchExpression = match.Groups["tomatchnotstring"].Value;
                results.ReplacePattern = GetStringFromGroup(match.Groups["replace"], results);
                if (match.Groups["onlyregex"].Success)
                    results.IsMatchOnlyRegex = true;
                    results.Regex = GetStringFromGroup(match.Groups["onlyregex"], results);
                    results.Regex = GetStringFromGroup(match.Groups["regex"], results);
                results.RegexNamespace = match.Groups["regexnamespace"].Success ? match.Groups["regexnamespace"].Captures[0].Value : null;
                RegexOptions options = RegexOptions.None;
                foreach (Capture capture in match.Groups["option"].Captures)
                    options |= (RegexOptions)Enum.Parse(typeof(RegexOptions), capture.Value, false);
                results.RegexOptions = options;
            results.IsEdit = false;
            results.CodeDomProvider = new VBCodeProvider();

            return results;

        protected override string GetStringMatchRegex(string matchName)
            string oneString = string.Format(CultureInfo.InvariantCulture,
                @"?<{0}>""(?("")""|.*?[^""]""(?!""))", matchName);
            string concatenatedStrings = string.Format(CultureInfo.InvariantCulture, @"(({0})\s*\&\s*_?\s*)*({0})", oneString);
            return concatenatedStrings;

        protected override string GetOptionsMatchRegex(string optionsName, string namespaceName, string optionName)
            string result = String.Format(CultureInfo.InvariantCulture, @"(?<{0}>" +
                @"(\s*(Or)?\s*(?<{1}>System\s*\.\s*Text\s*\.\s*RegularExpressions\s*\.\s*|" +
                @"Text\s*.\s*RegularExpressions\s*\.\s*|" +
                @"RegularExpressions\s*\.\s*)?" +
                @"RegexOptions\s*\.\s*(?<{2}>[a-zA-Z]+))+)", optionsName, namespaceName, optionName);
            return result;

        protected override Regex SyntaxRegex
            get { return syntaxRegex; }
            set { syntaxRegex = value; }

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About the Author

Andreas Andersen
Software Developer (Senior)
Denmark Denmark
.NET developer. I wanted to be first an astronaut, then a jet pilot, but when I got a Commodore 64 for Christmas I never looked back. Also I would never have qualified for the first two things and everybody knows computer programmers get all the girls.

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