function isOperation(str) {
  let opInfo = findOperator(str);
  if (opInfo) {
    opInfo.v1 = str.substr(0, opInfo.pos).trim();
    opInfo.v2 = str.substr(opInfo.pos + 1).trim();
    delete opInfo.pos;
    return opInfo;
  } else {
    return false;
  }
}
Is operation in string: '0.25 * $abc' => {operator: '*', v1: '0.25', v2: '$abc'}
@param {String} str