Web Scraping Software

Ten+ best online regex testers

Often, we need to prove regexes with an online tool or test them on different Regex engines. Here is an overview of online regex testers to assist you in your selection. Also, there is regex tester comparison table available.

Regex101 is a multi-purpose regex testing website where you can not only create and test regular expressions, but have them explained and debugged. The regex tester will highlight your regex pattern, detect errors and display detailed match information on the fly. A quick reference for the regex syntax is also available. The website supports JavaScript, PHP, PCRE and Python.


RegexHero is a .NET tester; it requires Silverlight plugin installation. It works great, especially in supporting named group replacements like: ${name2} ${name1}. It generates whether C#.NET or VB.NET code. Another feature is the benchmark scoping the code performance (iterations done per second). Also, you can choose the input text format, Unix (LF) or Windows (CRLF). It’s a great tool and free to install. For more features, Standard and Pro versions are available for a fee.


This tool is a convenient, fully-functional PHP engine tester with a good code generator for PHP, JAVA, JS, ASP.NET, C# and VB.NET. It provides matched groups highlighting, too. The PHP-like arrayed output is an essential feature.


RegexPal is a JavaScript engine testing tool for quick regex evaluation with convenient real-time regex syntax highlighting. It doesn’t support substitute or split functionality, though. However, it’s good in a mass match search.

Pagecolumn’s regex tester

Pagecolumn’s online fully-functional tool tests regexes both in PHP and JavaScript (neighbor link). One can select different JavaScript methods – exec, test, match, replace, split and its customized method, submatch. As a PHP tester, it supports both POSIX and PRCE, outworking with immediate PHP code generation. The JavaScript code is generated in real time, too. This nice outworked tester is good for beginners to write and play with regexes.


Regexlib is a .NET engine tester (also possible Client-engine invoking). It features the use of the searchable database of regexes provided in this site. However, it’s missing substitute and split functionality.


RegexPlanet is a regular expression test page for all known engines (languages): Java, JS, .NET, Python and also Perl, PHP, Ruby, XRegExp, while yet as beta-version. It allows multiple input strings for search (up to 10). It doesn’t generate a code, but provides target language functional outlook of the match/replace results and sub-results. The interface is also available in several European languages.


This is a simple and practical .NET engine online regex test tool, outworking even named group substitutions: (?<name1>\w+)\s*(?<name2>\w+).


A fully-functional online tool, it provides a handy RegExp snippet sidebar with descriptions, usage examples and community regexes to make it easier to learn regexes. It uses ActionScript 3′s built-in RegExp engine. One shortcoming is that the front page is not scalable, making users strain their eyes.


The Debuggex is the online Regex testing tool that allows visualization of Regex match algorithms. It uses the JavaScript engine for testing and it is also good for instant regex pattern match by real time highlighting matches. Shortcomings are the lack of named group functionality and only limited flags (regex pattern modifiers) are possibile to use.


This is a simple Ruby engine based tester with neither substitute nor split functionality.


This is a PHP PRCE/POSIX and JAVA online tester, a simple, on-the-fly tool.

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14 replies on “Ten+ best online regex testers”

Hi all,

I have a file which contains 100+ regular expressions and I want to get the output or possibilities of those regular expressions.
Please help me how to resolve this issue.

Anup, do you have a testing ground for these regexes to test upon?
Testing complexity issue.
Ex. this regex \d might have only those possibilities: digits: 0-9, having 101 possibilities. Yet the more complicated regex is the more possibilities it may match to, having exponential increase.
This regex \d{,2} might match one to two digits: 0-99, having 102 possibilities.

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