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https://issues.apache.org/jira/browse/HADOOP-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977667#action_12977667
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Daniel Templeton commented on HADOOP-2689:
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I've pulled together a short gawk script that handles the unrolling of 
regex-esque syntax quite nicely.  Since slaves.sh already depends on sed, I 
don't see any issue swapping out that dependency for gawk.  I just need to do a 
little more clean-up, and then I'll post the patch.

> RegEx support for expressing datanodes in the slaves conf files
> ---------------------------------------------------------------
>
>                 Key: HADOOP-2689
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2689
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 0.14.4
>         Environment: All
>            Reporter: Venkat Ramachandran
>
> It will be very handy if datanodes and task trackers can be expressed in the 
> slave conf file as regular expressions.
> For example, 
> machine[1-200].corp
> machine[400-679].corp

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