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Regex Tester and Debugger Online - Javascript, PCRE, PHP
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Rubular: a Ruby regular expression editor
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RegexPlanet - Online Regular Expression (Regex) Testing and Cookbook for: Go, Haskell, Java, JavaScript, .Net, Perl, PHP, PostgreSQL, Python, Ruby, Tcl & XRegExp
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jsPerf: JavaScript performance playground
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Sinon.JS - Standalone test fakes, spies, stubs and mocks for JavaScript. Works with any unit testing framework.
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CasperJS, a navigation scripting and testing utility for PhantomJS and SlimerJS
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Tests4Geeks - Online Programming & Coding Tests