in reply to Re: What does it mean that a "pattern cannot be reversed?"
in thread What does it mean that a "pattern cannot be reversed?"
What would be interesting, if anybody is up for it, is an actual concrete example of a nonreversible patttern, in either perl5 or perl6 syntax (or both).
is not permitted in perl5, because it is a variable length lookbehind. Glad to hear we get these in perl6.(?<=(a|aa))
Could someone throw out an example of what we can't do in perl6?
Maybe this is academic, but I like knowing the limits of pattern matching, as well as its power.
UPDATE: this seems to have just been answered, or at least a good attempt was made, by hv below, who must have been posting same time I was.
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