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Gmane
From: Neil Hodgson <nyamatongwe <at> me.com>
Subject: C++11 regex
Newsgroups: gmane.comp.lib.scintilla.devel
Date: Wednesday 24th July 2013 00:41:09 UTC (over 3 years ago)
Attached is an updated patch to use C++11's regular expression
implementation within Scintilla. Unlike previous versions it performs
backwards regex searches. The limited state of regex implementations in C++
support libraries means this isn't being committed now. The libstdc++
library used with g++ has an empty regex implementation, so this will not
work at all with g++. 

   Other implementations have problems with '^' and '$'. The runtime for
Visual C++ only recognises \n line ends for start/end line, not \r\n or \r.
libc++ used by Clang on OS X doesn't match '^' or '$' inside a search
range, only at the ends. To get around these issues, the patch performs
line by line searches, just like Scintilla's current limited regex. This
means that regex searches will not match over line ends. It may be possible
to add another flag to regex to choose between line by line and whole range
searches but the results of whole range searches are still going to be
platform dependent.

   I still want to add C++11 regex to Scintilla at some point but, for now,
applications that want good regex support should implement this in the
application code, possibly using calls like SCI_GETRANGEPOINTER for fast
access to the text inside Scintilla.

   Neil

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