id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12582	"Error catching specific ""regex_error"""	Pierre Vaillancourt <pierre.vaillancourt@…>	John Maddock	"The following try catch doesn't work in 1.61, but did work in 1.55.
Other boost exceptions are caught properly. I've provided two examples (one working, one failing)

== Exception is never caught ==

{{{
try
{
  boost::smatch m1;

  std::string long_String= ""@VOOfPHslmjhdQGM4CHjMII4tf-5-FjBnxaC6D8C3jQs09cdw8gDlF0bI7jfmN6cGKeZdJVOCt5GoeOVA3ao35rN-NV3Oy3A9V2hMUO0hHHVdWeGSoRY8ua3lnsXZsaOmz9YTZhR-Xtq13xAnYP5sHHbfM6tuuqWetdgCGNeMlckGyEKBW0MTtRq7Lhns8t7QW_59x77LRz2n0LtSS46sdN970eQ04llaeXZQDUv4coz6VuOBmEUUfLcxxc3HACSqdLQ-EmD_olxqPjR_mO2_ltjv_m2edvtn-5psCXZVpdVLKtcjl8ezLJQx5l30tIiPWkLDP_jot-lUe7ypMjXY68fo_E33L3eIyVTzyCWLSQdC9616-xA9gpMlHLDYOZL9MsxeOsK5v86OYkTn88IDtWV_bXfdEsN9m_p1CYKjwyhlBWH1h3uSz0WAzcIqqMDkNbQrF8sFmX7fVSC5OhazMnJHRnfcKCHfyCoTqA5horkQn0Kded3qFdtnZEvrOKgrGeiLjNwwlPuRQI2pD9StWHiI5b2ACyJ2wV8Xl7f4FKhr3H6xXpWKTEXNt4VjWZgfcVq9UCiThSLEBfHOEe1voARPHrDBw26VSjHVWacUZAAJ6Cf4AXsx8kvBsiw4HKyG6qdlYp6v03BEtLv_vP2neOGrDQAV5s9ED_qGGJVDgAxb_auZwL5lNE5Sw0KdWDBd"";

  static const boost::regex b1(""((?:[A-z0-9]+|[A-z\\-]+ ?)?(?: the )?(?:[Ss][Pp][Ii][Dd][Ee][Rr]|[Ss]crape|[A-Za-z0-9-]*(?:[^C][^Uu])[Bb]ot|[Cc][Rr][Aa][Ww][Ll])[A-z0-9]*)(?:(?:[ /]| v)(\\d+)(?:\\.(\\d+)(?:\\.(\\d+))?)?)?"");
       
  boost::regex_search(sample_kaspersky, m1, b1);
}
catch (...)
{
  //should catch a regex_error: The complexity of matching the regular expression exceeded predefined bounds....
}
}}}

The previous code block doesn't catch the exception but instead calls terminate:
{{{
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >' what(): The complexity of matching the regular expression exceeded predefined bounds.  Try refactoring the regular expression to make each choice made by the state machine unambiguous.  This exception is thrown to prevent ""eternal"" matches that take an indefinite period time to locate.
}}}

== Exception is caught properly ==

{{{
    try
    {
        // forcing an exception
        static const boost::regex b2(""((?:[?)?)?"");
        boost::smatch m2;
        boost::regex_search(sample_kaspersky, m2, b2);
    }
    catch (...)
    {
        //this work perfectly
    }
}}}"	Bugs	new	To Be Determined	regex	Boost 1.61.0	Regression		regex_error