I made a playground where you can try out regexps with lookbehind. https://dartpad.dartlang.org/8feea83c01ab767acdf1
On Tue, Oct 13, 2015 at 9:24 PM, Nozomu Katoo <[email protected]> wrote: > Erik Corry wrote on Tue, 13 Oct 2015 at 11:18:48 +0200: > > Yes, that makes sense. > > > > This could be fixed by removing {n} loops from positive lookbehinds. Or > by > > doing the .NET-style back-references immediately. > > Personally, I am reluctant to remove any feature from the current > proposal intentionally for a future proposal that it is uncertain > whether it really comes or not. It might end up only making lookbehinds > of ECMAScript and ones of Perl 5 incompatible. > > >> On 10/10/2015 03:48, Erik Corry wrote: > >> > >>> > >>> On Sat, Oct 10, 2015 at 12:47 AM, Waldemar Horwat wrote: > >>> > >>> It's not a superset. Captures would match differently. > >>> > >>> > >>> Can you elaborate? How would they be different? > >>> > >> > >> If you have a capture inside a loop (controlled, say, by {n}), one of > the > >> proposals would capture the first instance, while the other proposal > would > >> capture the last instance. > > I was missing that point. I just confirmed that > > perl -e "$a = 'abcdef'; $a =~ /(?<=.(.){2}.)./; print $1;" > > returned 'c' whereas .NET returned 'b'. Implementation based on my > proposal would return the same result as Perl 5. > > > By the way, at one point in this thread, I moved some email addresses > from To to Cc when sending my reply. But somehow several of them had > disappeared from the Cc field in the delivered email while they all > remain in a copy in my sent-email folder. I apologize to those who > received disconnected emails in this thread. > > Regards, > Nozomu > >
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