Re: [boost] Simple regex problem

From: Mathew Robertson (mathew.robertson_at_[hidden])
Date: 2005-02-02 22:40:20

I suspect that 

  [[:alphanum:]][-[:alphanum:]]*

is what is killing you... I'm not even sure what you are trying to match...

BTW:  do you need to use capturing (ie parenthesis)?  capturing can use lots of memory as well...

Mathew

----- Original Message ----- 
From: "Preston A. Elder" <prez_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Thursday, February 03, 2005 2:13 PM
Subject: [boost] Simple regex problem

> Hum,
> 
> Consider the following application (running on Linux with GCC):
> 
> === BEGIN CODE
> #include <boost/regex.hpp>
> #include <iostream>
> #include <exception>
> #include <typeinfo>
> 
> int main()
> {
>     try
>     {
>         std::string rx_string =
>             "^([[:alpha:]][-[:alnum:]]*[[:space:]]*)+$";
>         boost::regex rx(rx_string, boost::regex_constants::char_classes |
>             boost::regex_constants::intervals);
>         std::string test = "GlobalMSG HelpServ DevNull";
> 
>         if (boost::regex_match(test, rx))
>             std::cout << "Matched." << std::endl;
>         else
>             std::cout << "Not Matched." << std::endl;
>     }
>     catch (const std::exception &e)
>     {
>         std::cout << "Exception " << typeid(e).name() << ": " << e.what()
>              << std::endl;
>     }
> 
>     return 0;
> }
> === END CODE
> 
> The result of running this is:
> Exception N5boost14bad_expressionE: Memory exhausted
> 
> My question is, why?  The regex is simple enough, and the source string is
> quite short.  Please note, the same regex with the test string of:
>     "OperServ Magick-1"
> 
> runs and completes successfully without a problem.
> 
> Any ideas on how to fix this?
> 
> -- 
> PreZ :)
> Founder. The Neuromancy Society (http://www.neuromancy.net)
> 
> 
> _______________________________________________
> Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
>