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copied!<p>Most of those languages are open source. Any decent project should have their test cases in said repo, otherwise I would be pretty concerned.</p> <ul> <li><a href="http://hg.python.org/cpython/file/178075fbff3a/Lib/test/re_tests.py" rel="nofollow noreferrer">Python</a>'s regex tests</li> <li><a href="https://github.com/php/php-src/tree/master/ext/pcre/tests" rel="nofollow noreferrer">PHP</a>'s regex tests</li> <li><a href="http://perl5.git.perl.org/perl.git/tree/HEAD:/t/re" rel="nofollow noreferrer">Perl</a>'s regex tests looks really extensive</li> <li><a href="http://hg.openjdk.java.net/jdk7u/jdk7u6/jdk/file/8c2c5d63a17e/test/java/util/regex/" rel="nofollow noreferrer">Open JDK</a>'s unit tests (an open source flavour of Java)</li> <li><a href="https://github.com/ruby/ruby/blob/trunk/test/ruby/test_regexp.rb" rel="nofollow noreferrer">Ruby</a>'s regex tests</li> <li><a href="https://github.com/mono/mono/tree/0f2995e95e98e082c7c7039e17175cf2c6a00034/mcs/class/System/Test/System.Text.RegularExpressions" rel="nofollow noreferrer">Mono</a>'s regex tests (open source version of .NET)</li> <li><a href="https://github.com/google/re2/tree/master/re2/testing" rel="nofollow noreferrer">RE2</a>'s tests (C++ regex engine developed at Google)</li> <li><a href="https://github.com/att/ast/tree/master/src/cmd/re" rel="nofollow noreferrer">C</a> test suite (developed by AT&T Research)</li> <li><a href="http://vcs.pcre.org/pcre2/code/trunk/testdata/" rel="nofollow noreferrer">PCRE</a> regex tests (Perl Compatible Regular Expressions C library)</li> <li><a href="https://github.com/tc39/test262/tree/master/test/built-ins/RegExp" rel="nofollow noreferrer">JavaScript</a> regex tests (Ecma Technical Committee 39 compatability suite)</li> </ul> <p>I also found an extensive chart on <a href="http://www.regular-expressions.info/refflavors.html" rel="nofollow noreferrer">this page</a> which might be of some help to you.</p>

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