[Developers] Empty regexp patterns in perl

[Erik Schnetter]

An empty regexp patterns matches everything.  Perl makes this a special 
case: if a string is matched against an empty pattern, then instead the 
result of the last match is returned.

The CST stage needs to take this into account whenever a regexp pattern 
is constructed from a variable.  This happens e.g. when the default 
value of string parameters is checked against the allowed ranges.  I 
introduced there a explicit check for an empty pattern.

There might be other places in the CST stage where regexp patterns are 
constructed from variables.  Please keep this special feature of perl 
in mind.

-erik

-- 
Erik Schnetter <schnetter at aei.mpg.de>   http://www.aei.mpg.de/~eschnett/

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