[Issue 7551] Regex parsing bug for right bracket in character class

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7551


Dmitry Olshansky <dmitry.olsh at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement


--- Comment #4 from Dmitry Olshansky <dmitry.olsh at gmail.com> 2012-02-27 02:36:06 PST ---
Full backwards compatibility looked like a nice idea at start. 
I'm increasingly regret that decision, as things still got broken as I had to
add new features that block some undocumented behavior.

Ehm escape sequences were partly broken in 2.057 ... sorry about that.

BTW this page shows that [ and ] should be escaped, and not a single word on it
used as first character (unlike '-' that is supported).
http://www.php.net/manual/en/regexp.reference.character-classes.php

About Python, heh, I'm eager to see how would they go about adding set
operations without breaking compatibility (they count [ as plain '[' in the
middle of charset). I guess a brand new module if it they ever will.

> 
> But as a compromise: Perhaps a useful error message pointing out the escape
> thing could be added? Or it could be explicitly pointed out in a note in the
> documentation (to avoid special-casing the error code)?
> 
> I think some kind of "least surprise" handling for people coming from basically
> anywhere else might be useful ;-)

Hm.. that's a good idea. Hereby it's an enhacement request ;)

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