27>variableName

Correct variable names consist only of Latin letters, digits and underscores and they can't start with a digit. Check if the given string is a correct variable name. Example For name = "var_1__Int", the output should be variableName(name) = true; For name = "qq-q", the output should be variableName(name) = false; For name = "2w2", the output should be variableName(name) = false.

code>>

bool variableName(std::string name) {

std::regex r("^[a-z|A-Z|_.][a-zA-Z_0-9]*");

return regex_match(name, r);

}