[CWB] Finding bad non-category-handle values

[Scott Sadowsky]

I'm attempting to import a corpus into CQPweb, and when I try to change one
of the s-attributes from "free text" to "classification", I get the
following error:

*The datatype of text_source cannot be changed to [classification],
because there are non-category-handle values in the CWB index.*

I understand this to mean that in one or more values of text_source,
there's a character that's not a-z or _. My question is simply how do I get
a list of these values in order to figure out which one is causing the
problem and then fix it?

Thanks in advance!
Scott
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