> > Regex's are useful and powerful.  But they're also very easy to
> > abuse.  I've actually seen the following Perl code:
> > 
> >     if ($filename =~ /\.txt$/) { ... }
> > 
> > ...
> >
> > or, much more preferably:
> > 
> >     if filename[-4:] == '.txt':
> 
> Overall, the Perl code's better.  It didn't have to hard-code the
> length of the string.

	ext = '.txt'
	if filename[-len(ext):] == ext:

	etc...

Julian
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