The attributes you can set depend on the selected Action. Some Actions do not require any attributes; for others you should enter the preferred values, for example a length or a version number, pick a color, select an option from a list, select a checkbox, ... Setting the attributes is in most cases quite obvious.
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Regular expressions provide a way to find patterns within a text. This is useful in many contexts, for example to check whether a piece of text meets certain criteria, or to find and/or replace strings with a particular pattern. In PitStop Pro, regular expressions are used to configure the attributes of certain Actions (but only available in combination with equal/not equal operators). For an overview of the Actions concerned, refer to the Action manual on the Enfocus website.
PitStop supports Boost Regular Expressions. For more information, refer to http://www.boost.org/doc/libs/1_47_0/libs/regex/doc/html/boost_regex/synt ax/perl_syntax.html.
Examples:

). This allows you distinguish between severe and
less severe issues.
): If the check is positive, it will be logged as an
error that can be "signed-off", i.e. can be "approved" or evaluated as a
minor error which doesn't fail PDF certification. This is only relevant if
you're running Actions in the context of Certified PDF.
): If the check is positive, it will be logged as an error. If you're
running Actions in the context of Certified PDF, this kind of problems will
prevent the file from being certified OK. The problem must be fixed, before
the file can be certified.