text: #include "regex_yaml.h"
  
  namespace YAML {
  // constructors
  
  RegEx::RegEx(REGEX_OP op) : m_op(op), m_a(0), m_z(0), m_params{} {}
  RegEx::RegEx() : RegEx(REGEX_EMPTY) {}
  
  RegEx::RegEx(char ch) : m_op(REGEX_MATCH), m_a(ch), m_z(0), m_params{} {}
  
  RegEx::RegEx(char a, char z) : m_op(REGEX_RANGE), m_a(a), m_z(z), m_params{} {}
  
  RegEx::RegEx(const std::string& str, REGEX_OP op)
      : m_op(op), m_a(0), m_z(0), m_params(str.begin(), str.end()) {}
  
  // combination constructors
  RegEx operator!(const RegEx& ex) {
    RegEx ret(REGEX_NOT);
    ret.m_params.push_back(ex);
    return ret;
  }
  
  RegEx operator|(const RegEx& ex1, const RegEx& ex2) {
    RegEx ret(REGEX_OR);
    ret.m_params.push_back(ex1);
    ret.m_params.push_back(ex2);
    return ret;
  }
  
  RegEx operator&(const RegEx& ex1, const RegEx& ex2) {
    RegEx ret(REGEX_AND);
    ret.m_params.push_back(ex1);
    ret.m_params.push_back(ex2);
    return ret;
  }
  
  RegEx operator+(const RegEx& ex1, const RegEx& ex2) {
    RegEx ret(REGEX_SEQ);
    ret.m_params.push_back(ex1);
    ret.m_params.push_back(ex2);
    return ret;
  }
  }  // namespace YAML
  