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While running the following program using boost 1.26.0, I get an abort error. Any idea why?
string yexp = ".*{";
Curly braces are special in regexps: they must be paired. You probably meant this: ".*\\{" (It is also probable that, if you really did mean special curly braces, then putting them after the asterisk quantifier is a bad idea.) The abort was probably caused by an unhandled exception. Try catching all exceptions, e.g.: try { // do whatever } catch ( const std::exception & e ) { std::clog << "caught standard exception: " << e.what() << std::endl; } catch ( const std::string & s ) { std::clog << "caught c++ string exception: " << s << std::endl; } catch ( const char * s ) { std::clog << "caught C string exception: " << s << std::endl; } catch ( ... ) { std::clog << "caught unexpected exception" << std::endl; } Hope this helps. Best regards, Tony p.s. Boost 1.26? Really? That's *ancient*...