QuickREx2 is a regular-expression plugin for Eclipse. It features on-the-fly evalution, code-completion, group-navigation, different engines and a library for regular expressions.
This project is based on QuickREx (http://sourceforge.net/projects/quickrex).
Additionally to the original plugin this one has a button for importing a regular expression from the editor pane. This is very helpful if the regular expression has escaped characters in the regex string.
Imagine there is a Java file with a regex pattern like:
"My\\s\"product\"\\scosts\\$\\d+\\....