Re: [Boost-users] wregexundefined workaround

From: pps (i-love-spam_at_[hidden])
Date: 2005-03-13 23:24:41

  > The regex lib doesn't get much bigger, it's the dependency to ICU that
> gets you :-)
> 
> I suggest that you read the traits class docs, and then use 
> c_regex_traits as an example to work from.
> 
> John.

Woo-hhoo, I managed to compile new regex with icu, but I think it's too 
complicated for such little functionality that I need. I don't really do 
something serious - as a lesson to study boost regex I wanted to write a 
simple app that takes regular expressions from javascript ( that are in 
form /regex/im only) and writes out cpp source code that using boost 
regex does string match and returns bool. I assume that the input string 
is utf16 (without possibility of extra 2 bytes, just like in javascript).
Everything was done and tested, until I tried it on freebsd where wregex 
didn't exist and where sizeof wchar_t is different from vc_71.
Easier way to get this functionality is to rip off the regex part from 
spidermonkey (embeddable js engine) that borrows regex part prom perl as 
far as I know, or even easier just to embed it and use for completely 
compatible regex match; But I don't need easy routes :)
I tested with javascript - it does a good job with wide strings also. 
For example: /^\u03C6+$/i or /^\w+$/i will match "Φφ" correctly 
recognizing upper and lower case for greek PHi. I don't really need this 
*fancy* handling for chars over 0x7F. The entire javascript engine in a 
static lib is less than 2M, so ICU seems a bit heavy weight for simple 
functionality. The only extra thing I want to add over usual 
boost::regex is to be able to use \xHHHH or \uHHHH and that it would 
operate on 16-bit characters.
I looked for c_regex_traits and couldn't find this class - I found a lot 
of specializations for this template in different places (like 
template<> c_regex_traits ...).