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A Perl expression. You could use this for sed-like activities:

    # Print included files.
    ack --output '$1' '#include <(.*)>'
You could presumably do much trickier things as well, since the --output argument can contain any Perl expression.

That's a great example. I just replaced it as the example in the Top 10 List on the front of betterthangrep.com. Thanks.

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