Function separateStringIntoCoeffAndPaulis

quest/src/core/parser.cpp:147–163

void separateStringIntoCoeffAndPaulis(string line, string &coeff, string &paulis) {

    // absolutely gauranteed to match due to prior matching of regexes::line
    smatch match;

    // locate the coefficient
    regex_search(line, match, regexes::num);
    coeff = match.str(0);

    // the remainder of the line must be the paulis, but we explicitly match to
    // regex just in case we later permit additional substrings like comments. 
    // we must match only the substring AFTER the coeff, since valid coeffs (e.g.
    // 1) can be mistaken for a Pauli code.
    line = line.substr(match.position(0) + match.length(0));
    regex_search(line, match, regexes::paulis);
    paulis = match.str(0);
}


int getNumPaulisInLine(string line) {