Here's the relevant code:
boost::regex mulRegex(R"rgx(mul\(\d+,\d+\))rgx");
auto mulBegin = boost::sregex_iterator(inputData.begin(), inputData.end(), mulRegex);
bool isMulValid = true;
boost::regex doDontRegex(R"rgx((do(?!n't)|(?<!do )n't))rgx");
auto doDontBegin = boost::sregex_iterator(inputData.begin(), inputData.end(), doDontRegex);
std::vector<std::string> mulMatches;
auto dIt = doDontBegin;
for (auto it = mulBegin; it != boost::sregex_iterator(); it++) {
boost::smatch doDontMatch = *dIt;
boost::smatch mulMatch = *it;
if ((std::distance(dIt, it) < 0) && (doDontMatch.str() == "do")) { //segfault here
isMulValid = true;
dIt++;
} else if ((std::distance(dIt, it) < 0) && (doDontMatch.str() == "don't")) {
isMulValid = false;
dIt++;
}
if (isMulValid) {
mulMatches.push_back(mulMatch.str());
}
}
And here's where in the header file (match_results.hpp) there's a segfault:
const_reference operator[](int sub) const
{
if(m_is_singular && m_subs.empty()) //segfault here
raise_logic_error();
sub += 2;
if(sub < (int)m_subs.size() && (sub >= 0))
{
return m_subs[sub];
}
return m_null;
}
I did try changing std::distance to boost::distance, but that didn't help. Can anyone help me figure out how to avoid the segfault? Thanks in advance!
You're comparing iterators from different sequences: dIt vs it. You MIGHT compare the iterators into the source string instead:
if ((std::distance(dIt->begin().base(), it->begin().base()) < 0) &&
(doDontMatch.str() == "do")) {
isMulValid = true;
dIt++;
} else if ((std::distance(dIt->begin().base(), it->begin().base()) < 0) &&
(doDontMatch.str() == "don't")) {
isMulValid = false;
dIt++;
}
However this still lacks guard to check that dIt isn't equal to the end-iterator.
Why don't you just combine the regexen:
#include <boost/regex.hpp>
#include <fmt/ranges.h>
int main() {
std::string input =
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%mul(966,81)don't()( !>~'when()*mul(117,418)?do()how()}how()+who(326,8)mul(740,915)[}why()#what()mul(566,643)~&:/(@ when()%(mul(421,320){>select()when()who()<,(from()when()mul(262,130)select()>,'<<mul(690,379) &mul(735,499)mul(648,381)select()+}{${why()how()mul(434,100)mul}'*%when()~-^*!(do()^?+#?~mul(461,657){what()when()'why()()~mul(981,247)&$@mul(39,52)])/':&-@why()when()do()?where()mul(71,103)}~~mul(794,758)/+where())}/%?<!mul(475from()};mul(752,691)'~@^mul(244,863)$;what()>why()#where()}from()mul(111,990)^mul(840,910)<~select(367,802)@?}from() :mul(262,551)+^}>#'when()mul(937,18)&where()%# -from()*mul(369,863)@:)*+>don't()/^#mul(846,823)*mul(910,364)select()},)'/why()mul(75,30)@mul(206,337)-)-what()$}>mul(924,832) mul(948,363)(+mul(96#from();?'<select(865,160) ,mul(642,468)$who()how()select()[&mul(394,538);~where()mul(257,730)where(),mul(957,39)?from()why()-:'/where()mul(739,17)@what()%,where(14,86)^!mul(122,138)what(76,502){what()why(891,976)/when()mul(51,930)->:}$:>mul(956,973)-}%&#where()where(566,355)-@what()mul(643,945):mul(113,470)< how()-:]),,do()^[;+mul(650,992)why()what()>+:#mul~where():##:who()/don't()&mulfrom();mul(203,347)^why()'~mul(34,992)~mul(43,23)mul(461how()@where()when()don't()]&(-?;mulwhere() }>@who()>mul(587,787)mul(177,150)?&[mul(673,467){who(); ^@select()mul(489,258)#%,do()' }-'from()?*where()mul(519,991){<what()from(627,36)mul(398,646)#(:mul(604,21)how()*<{] &mul(82*%){mul(859,244),{(){mul(209,516)(select(174,175) ?mul(469,387)^[select()(select()when()mul(650,38)where()what()mul(213,981)$ !)why()@/who()'mul(75,263)%/{-)why()mul(743,980) $[^select();@mul(373,28)%;~select()$who()<'~$mul(341,452)$who()>~mul(100,786)how(116,173)</>mul(401,916)?*from()what()[how()!from())where()mul]%);{-'mul(198,617)?+-mul(684,266)select()don't()+!!!!& %mul(487<$where()when()mul(291,746)^select()select()>@from()mul(675,786)?when()mul(971,260)mul(381 from()]:]#who(){%~mul(625,149)who()select() <%mul(775,189)*who()&;mul(779,811)who(32,704);{[:%{[)?mul(426,194)select()$([mul(86,850)$ [,)>^^when()from(547,559)mul(160,267)<what(815,527)} who()*]}!mul(447,868)!,%%mul(81,235)[where()'what()from()&/#+mul(248,602);@+,what()+mul(664,457)[mul(817,900)where(): from()mul(738,909)}when()#]mul(848,133):}select(746,479)(@ *mul(363,137)??&+&*mul(345,309)<mul(880,710))@>/!*,!'mul(794,37)mul(526,419)/~(}+!where()who()how(580,118)mul(998,365);<what(278,677)->+mul(971,223)@when()<when()$mul(762,342)% !~who():mul(303,155){!what()^{mul(16,983)/$,&[*}mul(389,980)mul(62,453):$'$-mul(914,670){?+}mul(143,48]?mul(611,47)what()(where() -;[]-do()select()@@<who()@what(926,300)${mul(24,776)mul(688,201)(mul(337,398)}'who()where()]from()mul(457,600)/mul(496,888)]what()?~&&,&#mul(728,648)?from()where()mul(632,329)>/why()%mul(264,442)$who()$]how(347,766)]!~!~mul(44,835)}&don't())(mul(247,848)?who()from()how()&?!<'mul(4,587)mul(700,580)when()when(431,211)(mul(895,525)*#why()'))mul(118select()~mul(738,599)]%(*-^>'^:mul(320,963))[~+mul(25,220),#@mul(501,765)do()#mul-<>?how()from() mul(193,614)from()when()~&,mul(748,258)*#?where()who()why()/mul(2,3);{where(){mul(983,26)where(): ,mul(111,766)}$^#{mul(78,205)@?where()who()}^mul(836,378)don't()@%where() :who(65,691)>mul(612,507)^mul(609,895),mul(145,394))!where()who()% <$@who()mul(78,456)'where()#?how()mul(835,135)from(359,309)%/&,(}mul(806,416)[%+#)how()from()mul(776,153)~(;?who(){[mul(233,340)
~when()(select()who()how()mul(895,703)mul(723@from()!}]>mul(242,311)@{mul(45,928)^^&*,when(627,448)}when()who()*mul(916,537)[mul(796,856)'>when()why()&who()mul(650,488)}+#when()<%mul(944,505)why()?$*?from(953,19)do()mul(260,781)what():&what()/,mul(94,500)when()when(333,446);(when()~$^mul(475,992)mul(182,987))mul(539,499)how()>^)mul(965,326)%%:%[-mul(866,145)*$select()&~>mul(845,528)! where() select(),who()mul(233,174)mul(938,185) mul(968})mul(288,754)*,)^mul(21,938 how()what():~+ $;who()mul(45,150)#from()/< ,where(),don't()@from(20,864):^#}from()mul(904,694)}>mul(32,251) ]-'%+%/mul(537,614)why()what()select()^&where()what(761,969)<mul(394,510)how()who()what()>mul(666,129)when()]}($>when()-<mul(906,339),,how()~mul(172,337):-what()mul(961,996)where()%$}'/don't()who()~*@?)(,mul(200,564)'?%]#~!who()mul(446,6)&*^{mul(206,389)[mul(668,856)>@;don't()@*from()from()how() '#mul(671,116)where(),what()&]+from())$*mul(725,537))who()<*<+from()where()mul(209,705)/!!#mul(631,654);)>*#/}mul-how():}{]from()<mul(410,570)>^%where(){'<;who() mul(916,187),mul(627,593),>)+?why()<+?mul(772,583);;why()@mul(676,125)from()(where()where()what()mul(315,458)&'%%?$mul(967,658)from()mul(639,853)}>who()mul(569,506) what()what()what()'}<]%mul(674,667)[+how()where()select()&why()>&'mul(619,606)who()who(){from()<~[?/mul(257,454)(*&]@[ ]+don't()%:%why()+>&#(-mul(524,120)},mul(68,702)!mul(734,878):where(),#mul(363,999)!$~#&from()^<*how()mul(583,385)mul(609,453)who()mul(198,289)mul(456,335))select()when():}'mul(152,156)]&who()?~what():'mul(595,969)from();why()when()*+#why()from()!don't()'when()(;'?how()]'mul(978,210)#&when()how()):%?^]mul(395,664)'mul(912,244){),@:?'who();;don't()>{!where()why()when()$]*>mul(948,729)'~)select()-'*mul(186,228)]#;@ )}}mul(261,980)<<where()/mul(582,578)where(){who()mul(750,230)]what()*,$from()who()do()mul(46,807)%where()select()]-<mul(792,172)mul(822,372)^$&+>{/when()+?mul(291,330)mul(121,244)mul(836,102)]<how():]{)how()mul(372,630)$}~}when()]$:[mul(328,505))-@-from(838,843)''mul(95,158); :don't()why()?mul(176,511)-]@*;#from()?;;mul(353,178)%what()*{don't()%?what()~,;;$&'mul(785,2)from()[#>mul(876,667)$}%,:-+-mul(493,878)>why()~+~}!:where()-mul(880,424)why(770,240)who()why()+>!>select()select()@mul(627,730)//;} select()mul(307,530)]/ / @who()!don't()/;{+select()}{~mul(404,620),[)~}}):+do()>how()[mul(667,655)%?mul(322,981)<when()#mul(837,392)why(677,359)%'how()select()mul(724,781)mul(564,891)?[!mul(605,35)!-&[;]what())what(364,266)do():/)-}~]why(),mul(602,940)?mul(714,278)why() where()~^mul(770,700){when()select()'&mul(960,514)what()~*$&~what())mul(43,61)*where()[@;mul(157,53){#*&(where()from()(how()where()mul(507,423)~%%'*[] ?mul(423,315)what(),<from():$,select() mul(988,45)#%!mul(376,354)who()mul(704,65)+;:!^ (who()mul(329,461)&where()<from()select()><mul(785,621)/)mul(976,631)from()*?what()mul(719,163)-<')+,{}-mul(858,587)why()~mul(270,973)}mul(206,60)mul(906,800)&) *!~@+how(70,886)@mul(639,518)]mul(931,666)'/^-> how(711,736);mul(629,379)why()%&};why()~mul(480,801)-^^ $mul(633,131)how()from();%:)%^&!don't()mul(329,229)who(),when()<>mul(146,399);#[:;:don't()><]mul(819,85)(when(){mul(812,398)*#^%select()mul(256,504)from():mul(824,150)*)?when()?#@>,mul(955,85)who()!?who()-from()mul(77,506)?[#>:@$'mul(667,680)} &,['%+mul(521,388)&^, &#)~~~";
boost::regex const re(R"rgx((mul\(\d+,\d+\))|(do\(\))|(don't\(\)))rgx");
boost::sregex_iterator b{input.begin(), input.end(), re}, e{};
std::vector<std::string> muls;
bool enabled = true;
for (; b != boost::sregex_iterator(); ++b) {
if (boost::smatch m = *b; m[2].matched) {
enabled = true;
} else if (m[3].matched) {
enabled = false;
} else if (enabled) {
muls.push_back(m.str());
}
}
fmt::print("muls: {}\n", muls);
}
Printing the expected
muls: ["mul(427,266)", "mul(287,390)", "mul(398,319)", "mul(990,506)", "mul(63,701)", "mul(386,211)", "mul(850,88)", "mul(206,161)", "mul(488,490)", "mul(375,471)", "mul(567,455)", "mul(529,980)", "mul(121,730)", "mul(820,390)", "mul(129,546)", "mul(332,834)", "mul(405,595)", "mul(392,884)", "mul(32,781)", "mul(571,9)", "mul(722,448)", "mul(409,423)", "mul(216,914)", "mul(100,814)", "mul(582,883)", "mul(73,318)", "mul(95,625)", "mul(257,861)", "mul(166,899)", "mul(210,918)", "mul(142,506)", "mul(157,271)", "mul(599,342)", "mul(854,498)", "mul(817,886)", "mul(884,982)", "mul(227,381)", "mul(523,852)", "mul(748,939)", "mul(382,349)", "mul(312,240)", "mul(280,635)", "mul(762,944)", "mul(86,637)", "mul(879,416)", "mul(549,406)", "mul(88,855)", "mul(908,190)", "mul(738,858)", "mul(244,786)", "mul(546,413)", "mul(577,49)", "mul(589,160)", "mul(646,29)", "mul(428,692)", "mul(18,727)", "mul(662,289)", "mul(130,76)", "mul(176,27)", "mul(390,185)", "mul(649,266)", "mul(71,265)", "mul(285,789)", "mul(399,312)", "mul(70,238)", "mul(917,868)", "mul(438,62)", "mul(833,695)", "mul(935,290)", "mul(630,652)", "mul(281,551)", "mul(668,937)", "mul(855,368)", "mul(394,160)", "mul(156,502)", "mul(510,5)", "mul(67,196)", "mul(82,797)", "mul(449,254)", "mul(177,264)", "mul(214,245)", "mul(388,902)", "mul(817,942)", "mul(158,891)", "mul(526,761)", "mul(875,326)", "mul(615,449)", "mul(222,501)", "mul(627,783)", "mul(367,274)", "mul(893,21)", "mul(684,227)", "mul(903,634)", "mul(256,820)", "mul(252,391)", "mul(302,901)", "mul(959,150)", "mul(707,60)", "mul(346,903)", "mul(162,123)", "mul(607,986)", "mul(970,450)", "mul(944,547)", "mul(580,289)", "mul(709,677)", "mul(10,529)", "mul(458,346)", "mul(315,458)", "mul(812,748)", "mul(804,59)", "mul(357,79)", "mul(4,139)", "mul(955,257)", "mul(306,23)", "mul(708,911)", "mul(421,641)", "mul(501,26)", "mul(133,700)", "mul(414,12)", "mul(762,731)", "mul(169,103)", "mul(942,416)", "mul(515,151)", "mul(81,656)", "mul(291,623)", "mul(721,646)", "mul(186,854)", "mul(59,522)", "mul(38,721)", "mul(370,999)", "mul(979,803)", "mul(656,360)", "mul(940,701)", "mul(999,807)", "mul(135,491)", "mul(547,465)", "mul(350,508)", "mul(944,107)", "mul(805,698)", "mul(938,462)", "mul(736,752)", "mul(614,981)", "mul(397,776)", "mul(435,814)", "mul(839,4)", "mul(95,582)", "mul(897,981)", "mul(232,868)", "mul(501,202)", "mul(505,973)", "mul(846,502)", "mul(627,131)", "mul(986,900)", "mul(739,824)", "mul(315,354)", "mul(55,825)", "mul(966,81)", "mul(740,915)", "mul(566,643)", "mul(421,320)", "mul(262,130)", "mul(690,379)", "mul(735,499)", "mul(648,381)", "mul(434,100)", "mul(461,657)", "mul(981,247)", "mul(39,52)", "mul(71,103)", "mul(794,758)", "mul(752,691)", "mul(244,863)", "mul(111,990)", "mul(840,910)", "mul(262,551)", "mul(937,18)", "mul(369,863)", "mul(650,992)", "mul(519,991)", "mul(398,646)", "mul(604,21)", "mul(859,244)", "mul(209,516)", "mul(469,387)", "mul(650,38)", "mul(213,981)", "mul(75,263)", "mul(743,980)", "mul(373,28)", "mul(341,452)", "mul(100,786)", "mul(401,916)", "mul(198,617)", "mul(684,266)", "mul(24,776)", "mul(688,201)", "mul(337,398)", "mul(457,600)", "mul(496,888)", "mul(728,648)", "mul(632,329)", "mul(264,442)", "mul(44,835)", "mul(193,614)", "mul(748,258)", "mul(2,3)", "mul(983,26)", "mul(111,766)", "mul(78,205)", "mul(836,378)", "mul(260,781)", "mul(94,500)", "mul(475,992)", "mul(182,987)", "mul(539,499)", "mul(965,326)", "mul(866,145)", "mul(845,528)", "mul(233,174)", "mul(938,185)", "mul(288,754)", "mul(45,150)", "mul(46,807)", "mul(792,172)", "mul(822,372)", "mul(291,330)", "mul(121,244)", "mul(836,102)", "mul(372,630)", "mul(328,505)", "mul(95,158)", "mul(667,655)", "mul(322,981)", "mul(837,392)", "mul(724,781)", "mul(564,891)", "mul(605,35)", "mul(602,940)", "mul(714,278)", "mul(770,700)", "mul(960,514)", "mul(43,61)", "mul(157,53)", "mul(507,423)", "mul(423,315)", "mul(988,45)", "mul(376,354)", "mul(704,65)", "mul(329,461)", "mul(785,621)", "mul(976,631)", "mul(719,163)", "mul(858,587)", "mul(270,973)", "mul(206,60)", "mul(906,800)", "mul(639,518)", "mul(931,666)", "mul(629,379)", "mul(480,801)", "mul(633,131)"]