Showing content from https://cplusplus.com/reference/regex/regex_traits/value/ below:
public member function
<regex>
std::regex_traits::value
int value (char_type c, int radix) const;
Value of a digit character
Returns the value represented by the digit c in base radix.
If c is not a valid digit character, the function returns -1.
Parameters
-
c
-
A character.
char_type is a member type, alias of the character type. In regex_traits it is an alias of its template parameter (charT).
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radix
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The numerical base: either 8 (for octal), 10 (for decimal) or 16 (for hexadecimal).
Return value The value representation of c if c is a valid digit, or -1 otherwise.
See also
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regex_traits
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Regex traits (class template)
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