Re: [Boost-users] Regex problem

12 Mar 2008

      My platform is Mac OS X 10.5.2.  I'm compiling and running via Xcode  
3.0.  Boost is version 1.34.1 (I installed it in the last two weeks).   
It was compiled on this machine by running "sudo make install", which  
installed it in /usr/local/include/boost.  The library files are in / 
usr/local/lib.  In my project specification, I specify those paths in  
my Library and Header search paths, and also add the linker option "- 
lboost_regex".

The following code gets a EXC_BAD_ACCESS error and never executes the  
catch blocks:  (I realize that the pageSource doesn't actually have a  
<script> tag;  That's because I don't know if the pages I'll be  
parsing will have one.  However, the code still fails even if there is  
a <script>TESTSCRIPT</script> tag in there.)

#include <iostream>
#include 
#include <string>

using namespace std;

int main (int argc, char * const argv[]) {
	string * pageSource = new string("<html><head><title>Some title</head><body>Hello, world!</body></html>");
	try {
		boost::regex tagRegex("(?:i)]*>.*?]*>");
		string replaced = boost::regex_replace(*pageSource, tagRegex, " ",  
boost::match_default);
		delete pageSource;
		pageSource = new string(replaced);
	} catch (exception &e) {
		cout << e.what() << endl;
	} catch ( ... ) {
		cout << "Unknown exception" << endl;
	}

	cout << *pageSource << endl;

	delete pageSource;
     return 0;
}

Any help would be greatly appreciated, as this project is due  
tomorrow.  =)

Thanks,

Dave

On 12 Mar, 2008, at 7:50 AM, John Maddock wrote:
...
Dave DeLong wrote:
...
...
Ah, you're right.  That was one of my attempts to fix it (which you
can guess didn't work).
As for the inefficiency, this is my first stab at regex.  =)
Here's the complete function as it stands (or doesn't, since it  
still
crashes):
void Page::removeScriptTags() {
boost::regex tagRegex("(?:i)]*>.*?]*>");
string source(*pageSource);
string replaced = boost::regex_replace(source, tagRegex, " ",
boost::match_default);
delete pageSource;
pageSource = new string(replaced);
}
That looks fine as it stands, but unless you can reduce it to a  
complete
test case that I can compile and run here it still doesn't help  
much.  Also
what compiler, platform and Boost version are you using?  Also  
please check
that there isn't some binary-compatibity issue going on: building  
your app
with different options than Boost was built with, or linking to a  
library
file that's from a different Boost version to the headers you're  
#including
etc...
John.
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