.NET Regular Expression Designer Alternatives

iHateRegex offers an easy way for developers to find helpful and reusable regular expressions while also providing an intuitive playground to interact with regex snippets to create or just learn.

Debuggex is an intuitive visual regular expression debugger, tester, and helper.

Create, edit, and test RegEx Regular Expressions. Replace, format, and extract text in files using Regular Expressions. Perform GREP-like tasks, use RegEx substitutions, extract data! Supports color syntax highlighting and contextual tooltips making it easy to design patterns.

RegViz is a tool for debugging JavaScript regular expressions in a visual way. Advanced highlighting helps you to understand the structure and purpose of a regular expression and to detect bugs therein.

CyrilEx is an online regex tester, it allows to test regular expression in PHP (PCRE), Python, Ruby, JavaScript, Java and MySQL.

Scriptular is a web-based JavaScript regular expression editor base on the look and feel of Rubular. Use it online in your browser for free or download the open-source code and host it for yourself on your computer.

What RegExpEditor is can be said easyest by telling what it is not: It is not an editor for regular expressions. Although it can be used for this purpose. Instead RegExpEditor is a text editor that allows you to alter text using regular expressions.

A ruby based regular expression editor.

The Regex Coach is a graphical application for Windows which can be used to experiment with (Perl-compatible) regular expressions interactively. It has the following features:

Expressions is a minimal, distraction-free tool for experimenting with regular expressions.

jRegExAnalyser is an interactive tool written in Java to write, test, debug, analyse and profile regular expressions. Its free and Open Source software, licensed under the terms of GPLv2 with Class Path Exception.

This software will let you design your regexps by letting you type the expression and visualize its effect on a sample of your choice.