I'm trying to display some messages to the user when the input is invalid.
I wrote this regex, to validade this pattern : (Name of 10 characters) (Number between 0-9)
e.g. Bruno 3
^([\w]{1,10})(\s[\d]{1})$
When the user input any invalid string, Is it possible to know what group is invalid and print a message? Something like that:
if (regex_match(user_input, e))
{
cout << "input ok" << endl;
}
else
{
if (group1 is invalid)
{
cout << "The name must have length less than 10 characters" << endl;
}
if (group2 is invalid)
{
cout << "The command must be between 0 - 9" << endl;
}
}
As I see you want to match 1 to 10 character then a single space and then a single digit but in 2 group
here is what you want:
^([a-zA-Z]{1,10})( \d)$NOTE
\w is equivalent to [a-zA-Z0-9_]
So if you need only 10 characters you should use [a-zA-Z] not \w
C++ code
std::string string( "abcdABCDxy 9" );
std::basic_regex< char > regex( "^([a-zA-Z]{1,10})( \\d)$" );
std::match_results< std::string::const_iterator > m_result;
std::regex_match( string, m_result, regex );
std::cout << m_result[ 1 ] << '\n'; // group 1
std::cout << m_result[ 2 ] << '\n'; // group 2
the output
1abcdABCDxy
9
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