And here's a similar playground for .Net, not by me: http://www.regexplanet.com/advanced/dotnet/index.html
On Tue, Nov 10, 2015 at 11:08 AM, Erik Corry <[email protected]> wrote: > 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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