And I've encountered some features, described in camel book(s), which just don't work in some (or most, or modern ) versions of perl, for example:
001 while ($sth=~/sth(sth)/g)
002 {}
shortcut. This used to work in 5.000, stopped working in 5.6 because of broken
optimisation. I reported the bug, but apparently this was considered a buglet, and left as is.
This forced me, (and for example Apache::ASP project) to instead use unefficient replacement:
001 $mycopyofstring=$sth;
002 while ($mycopyofstring=~s/sth(sth)/) {
003 }
I don't know what you're trying to show here, but the second example is a syntaxt error (Substitution replacement not terminated).
The point here, is that important features of language appear and disappear at will, thus you've got to stay in-loop all the time, keeping and eye on changes, hoping that what you've learned won't be thrown out of the window next sumer.
Important features? I think you mean
experimental features.
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