Item2211: IfDefinedPlugin: Nested quantifiers in regex

Following code results in an error: Nested quantifiers in regex.

%IFDEFINED{"%VAR%" as="C++" then="true" else="false"}%

It seems, that only the 'as' part is sensitive to the letters '++'. We expect, that other regex like letter combination might result in errors too.

-- AndreLichtsteiner - 05 Oct 2009

Try

%IFDEFINED{"%VAR%" as="C\+\+" then="true" else="false"}%

The as parameter is used as a regular expression. Well and + is an iterator quantifier with ++ being an invalid expression.

Whenever possible: try to use %IF instead of %IFDEFINED. The former is much more capable and performing better as well.

To prevent to escape the double + try the %IF equivalent of that test:

%IF{"$VAR='C++'" then="true" else="false"}%

Basically this is not really an error of IfDefinedPlugin, only an annoyance ... which is avoided best as outlined above.

-- MichaelDaum - 05 Oct 2009

Ciao Michael

The error occurs in an Wiki application organizing topics with tags and categories

The applications crashes with a tag named 'C++', we do not program the faulty line manually.

-- AndreLichtsteiner - 05 Oct 2009