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https://issues.apache.org/jira/browse/HADOOP-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976287#action_12976287
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Daniel Templeton commented on HADOOP-2689:
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This would be something fairly easy to write in a higher level language like 
Perl or Python, but that would create an additional dependency on an 
interpreter.  It's probably possible to implement just as a bash script, maybe 
with some embedded gawk, but it will be nasty ugly.  Preferences?

> 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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