On Dec 3, 2013 10:08 AM, "Erik Christiansen" <dvalin@internode.on.net> wrote:
>
> On 02.12.13 19:41, Marc Weber wrote:
> > > I do not remember clearly, but was not it suggested to take PCRE syntax? I
> > > do not remember any discussions suggesting taking PCRE and replacing parser
> > > code, but I may have missed something.
> > I don't remember wether it was public. Facts: PCRE is fast, it already
> > implements what Bram had in mind, it even has JIT support.
> > But yes, it would be PCRE syntax, too. (Is this good or bad?).
>
> Bad, I suggest.
> Posix EREs are powerful, and standard across many utilities.
> What is important here is that a new regex dialect need not be learnt
> for every utility we use. Productivity results from leveraging learning
> across tools.
Vim syntax looks like BRE (*not* ERE) on steroids unless you use very magic modifier at the start of regex. It looks like nothing else if you do. It is vim who has unique syntax.
PCRE has a bunch of similarities with ERE (nearly any ERE regex can be used without modifications with PCRE) and is pretty common: Perl 5, Python, Ruby, go, PHP, grep (if build with PCRE support and provided -P switch), zsh (if build with PCRE support and some options enabled or specific comparison switch is used).
Note that neither Python nor Perl are actually using PCRE: Python just borrowed the syntax and Perl is where PCRE borrowed syntax from. Do not know which of the other languages I mentioned with PCRE-like regex syntax are actually using PCRE.
Thus by bringing this argument you contradict yourself: if you want to leverage learning across utilities you must use PCRE.
> Erik
>
> --
> The Kyoto Protocol, drafted in 1997, aimed to reduce the world's greenhouse gas
> emissions by around five per cent from 1990 levels by the end of 2012.
> Instead, global greenhouse gases have risen around 58 per cent in that time.
> - http://www.abc.net.au/news/2012-12-08/troubled-un-climate-talks-spill-over/4416696
>
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