Useful regular expression tutorial

Is there a good tutorial on using regular expressions, especially with grep? I tried googling for some, but most tutorials are too basic and cover things I already know.

Answers has a tutorial section. This site is pretty comprehensive for regular expressions in general, although the emphasis is on support in scripting and programming languages.

The J. Friedl book on mastering regular expressions (mentioned elsewhere), is definitely an outstanding resource, and essential reading if you are serious about doing what the title says.

Anyone who uses regular expressions routinely, or as part of their job, would do well to pick up the book. Browsing around for tutorials is not really conducive to proficiency, in regex-land.

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Odd NullPointerException when reproducing a Java OpenGL ES 2.0 demo in Scala

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I'm trying to reproduce this JOGL demo, a Java demo on how to use OpenGL ES 2.0, in Scala. Compiling succeeds, but trying to execute this yields the following output:

Easier TFS Build Definition Update

visual-studio-2010 version-control tfs tfs2010

I am new to a company which uses TFS as a source manager. Currently when we make a new branch we create a copy of an old Build, then manually go in and edit all the workspace file paths and process