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Took awhile for a response to this feature request. ;-)

Perl's heavy integration of regular expressions with its
taint facility probably wouldn't work all that well in
Python.  For one, Python has more ways of searching
strings than with regular expressions.  Second, regular
expressions are not nearly as tightly wound into Python
as they are in Perl.  I think you'd have to add a taint
attribute to strings and just rely on the programmer to
properly clear that attribute.

I think a first cut at an implementation would go much
further toward getting the concept seriously considered
for addition to Python.