can somebody give an example usage of pcrecpp "DoMatch" routine? - pcre

Question

Can somebody give an example usage of pcrecpp DoMatch routine? Basically my requirement is to capture all the matches into a vector. I don't want to use FullMatch or PartialMatch because they record the matches in the arguments passed to them.

Answer 1

I had found this example on the web a while ago. I can't seem to find the link now.
vector<string> regex_tools::regex_matches(const string& str
, const string& regex
, bool ignorecase
, bool submatches)
{
vector<string> svec;
pcrecpp::RE_Options opt(PCRE_DEF_FLAGS);
opt.set_caseless(ignorecase);
pcrecpp::RE re(regex, opt);
int n = re.NumberOfCapturingGroups();
if (n <=0)
return svec;
else if(n > 10){
fprintf(stderr, "Overflow: There are too many capturing groups\n");
return svec;
}
/* sigh */
string matches[10];
const pcrecpp::Arg *args[10];
int z = 0;
pcrecpp::Arg arg0 = &matches[z];
args[z++] = &arg0;
pcrecpp::Arg arg1 = &matches[z];
args[z++] = &arg1;
pcrecpp::Arg arg2 = &matches[z];
args[z++] = &arg2;
pcrecpp::Arg arg3 = &matches[z];
args[z++] = &arg3;
pcrecpp::Arg arg4 = &matches[z];
args[z++] = &arg4;
pcrecpp::Arg arg5 = &matches[z];
args[z++] = &arg5;
pcrecpp::Arg arg6 = &matches[z];
args[z++] = &arg6;
pcrecpp::Arg arg7 = &matches[z];
args[z++] = &arg7;
pcrecpp::Arg arg8 = &matches[z];
args[z++] = &arg8;
pcrecpp::Arg arg9 = &matches[z];
args[z++] = &arg9;
pcrecpp::StringPiece input(str);
int consumed;
do {
if (re.DoMatch(input, RE::UNANCHORED, &consumed, args, n)) {
input.remove_prefix(consumed);
for (int t = 0; t < n; t++){
svec.push_back(matches[t]);
}
}
else
break;
} while (submatches);
return svec;
}