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Most but not all Perl regular expression constructs are supported by the Java regex engine; see the Javadoc for java.util.regex.Pattern for full details. (See the section "Comparison to Perl 5")

with pre made examples for HTML ( extract urls, emails, tags...) Uses Microsoft Silverlight 

Web-based text search utility with full regular expressions support, advanced match highlighting and text replacement functions

full-featured web based text search utility with full regular expressions support, advanced match highlighting and text replacement capabilities.

This site is a Regular Expression evaluator for three different regular expression systems: 1. PHP PCRE. 2. PHP Posix. 3. Javascript.

XML-tools - format xml - parse xml (xsd) - parse xml (dtd) - eval xpath - XSLT-tools - run xslt - Base64-tools - base64 encode - base64 decode - Hash-tools - md5 - sha - sha-256 - sha-512 - htpasswd - regular expressions - evaluate - JSON-tools - format json - xml2json

visualize regular expressions simply

As the first online Regular Expression tester to offer realtime highlighting and offering more languages than any other online tester, ReJAx continues to be the coolest and easiest to use Regular Expression tester on the web. Supported languages:
    * JavaScript
    * PHP 5 PCRE
    * PHP 5 POSIX
    * Ruby - BETA!!
    * PERL 5
    * UNIX Shell Pattern
It is not necessary to enter the beginning and ending slashes in the pattern field. Not all modifiers will be compatible with every language. Backreferences (when available) are usually in the form of \n where n is the reference number