Just curious if any headway has been made on this lookbehind regex issue?

I only ask because it breaks a pretty popular JS syntax plugin.

On Tuesday, August 13, 2013 5:34:52 PM UTC-7, Amadeus Demarzi wrote:
> Alright, so I am admittedly terrible with Regexes, but I think I did find 
> something.
> 
> Using this file for the regex test:
> 
> https://gist.github.com/amadeus/82d0288a9b8b2e3ff2a9
> 
> And using this regex in search, with hlsearch on:
> 
> \(\(\(return\|case\)\s\+\)\@<=\|\(\([)\]"']\|\d\|\w\)\s*\)\@<!\)\/
> 
> Both engines 1 and 2 highlight the / right after `case` and `return`. Only 
> engine 1 highlights the / on line 1 though.
> 
> On Tuesday, August 13, 2013 12:56:21 PM UTC-7, Amadeus Demarzi wrote:
> > I am pretty bad with regex stuff, but I will try to figure out how to 
> > isolate it.
> > 
> > I posted it here quickly just in case there was something silly I was 
> > missing in that snippet. 
> > 
> > For what it's worth, it's used in this syntax plugin:
> > 
> > http://github.com/pangloss/vim-javascript
> > 
> > And setting the regexpengine=1 | syntax enable fixes the problem, although 
> > it's a far from ideal solution.
> > 
> > On Tuesday, August 13, 2013 11:09:49 AM UTC-7, Bram Moolenaar wrote:
> > > Amadeus Demarzi wrote:
> > > 
> > > 
> > > 
> > > > With the update to vim 7.4, it seems as if this particular regex just
> > > 
> > > > doesn't match in particular cases in 7.4, but it worked fine in 7.3.
> > > 
> > > > 
> > > 
> > > > syntax region  jsRegexpString    
> > > > start=+\(\(\(return\|case\)\s\+\)\@<=\|\(\([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+
> > > >  skip=+\\\\\|\\/+ end=+/[gimy]\{,4}+ 
> > > > contains=jsSpecial,jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial,@htmlPreproc
> > > >  oneline
> > > 
> > > > 
> > > 
> > > > Does not match in 7.4, but did in 7.3:
> > > 
> > > > var x = /test/;
> > > 
> > > > 
> > > 
> > > > Matches in 7.4 and 7.3:
> > > 
> > > > return /test/;
> > > 
> > > > 
> > > 
> > > > I am posting in here in case there is a simple quickfix that I am
> > > 
> > > > overlooking. Otherwise I can attempt to put together a more
> > > 
> > > > reproducible test case.
> > > 
> > > 
> > > 
> > > I'll see if I can reproduce it.  Please try to come up with a simple
> > > 
> > > search pattern that fails.  You can use 'regexpengine' to select the old
> > > 
> > > code.  A syntax command makes it difficult to pinpoint the problem.
> > > 
> > > 
> > > 
> > > -- 
> > > 
> > > From "know your smileys":
> > > 
> > >  ~#:-(    I just washed my hair, and I can't do nuthin' with it.
> > > 
> > > 
> > > 
> > >  /// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net   
> > > \\\
> > > 
> > > ///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ 
> > > \\\
> > > 
> > > \\\  an exciting new programming language -- http://www.Zimbu.org        
> > > ///
> > > 
> > >  \\\            help me help AIDS victims -- http://ICCF-Holland.org    
> > > ///

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