I think there should also be an option to not only allow but force tabs on a
source code. This could be handled by a property
"checkstyle.indent" with possible values "space,tab,both", for
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The upcoming release 3.0 includes the ability to check for
illegal regular expressions. Each line that matches the
regexp will be flagged as an error.
Your request is covered by that Check, you can use the
following module definition to enforce your style:
<property name="format" value="^\t* "/>
This will not allow spaces in the indentation part of a
source line, even if there are tabs between the beginning of
the line and the space character.
Sourceforge introduced a linebreak where there should be
none. The value of the format property should have a space
after the star, after the space the string should end, i.e.
Closing the issue.