Test your Java Regular Expressions ( REGEX ) Online

If you've ever worked with regular expressions using the java.util.regex package in Java, you know it can be a slow process to thoroughly test your regular expression. I recently found a website that allows you to test your regex using the java.util.regex package and actually provides detailed feedback.
Using fileformat.com's Regular Expression Test Page, you can run test data through Java's regex engine and see the Matcher's output methods such as matches(), replaceFirst(), replaceAll(), lookingAt(), and find(). It will also show you the groups your regular expression creates.

The next time you are writing some fancy regular expressions for use in the java.util.regex package, make sure you use this handy tool for testing your regex in Java.