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What does it mean that a "pattern cannot be reversed?"by tphyahoo (Vicar) |
on Jan 06, 2005 at 17:42 UTC ( [id://420007]=perlquestion: print w/replies, xml ) | Need Help?? |
tphyahoo has asked for the wisdom of the Perl Monks concerning the following question:
Monks, I was looking at Synopsis 5, which is the intro to perl 6 regexes, or as they are now called, "rules." We have here
What does it mean that a pattern cannot be reversed? Does this have anything to do with the unfortunate situation that variable length lookbehinds are not allowed in Perl 5? Will variable length lookbehinds be allowed in Perl 6? (Though I'm not sure this is even relevant to the concept of pattern reversability, just a guess...) Googling on this concept was unhelpful. Thanks for your wisdom! thomas.
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