Regex Tester

• Download source files - 12.2 Kb
• Download demo project - 5.33 Kb

Introduction

The Regex Tester is an application to use for testing regular expression patterns on a test string, as we create the pattern, rather than testing it on the actual input, which may be sometimes time consuming, especially for large input strings.

Using the RegexTester

The usage is more straight forward. The input string is typed in the test string box, and the pattern is typed in the pattern textbox, as shown above.

Regular Expressions in .NET

Using regular expressions in .NET is pretty simple.. using the regularexpressions namespace available

Imports System.Text.RegularExpressions
' import the namespace


'instantiate the objects

dim oRegex as new regex("test pattern")

'use the object

If oRegex.IsMatch("this is the string to test on") Then
    msgbox "Match found"
else
    msgbox "Didnt find match"
end if

Points of Interest

The RegexTester with this article has a little nice feature for you to experiment. If the test string box is left empty, the application searches for a file teststring.txt (can be anything if the code attatched is aptly modified), and if the file is found, uses the contents of the file as a test string. This feature comes in needy, when the input string / test string is large.

If you already are conversant with simple .NET programming and the process of creating regular expression patterns, the Regex Tester might be all u need. ;)