cpp/regex/regex traits/value

Determines the value represented by the digit in the numeric base, given the currently imbued locale. This function is called by std when processing Quantifiers such as or, Backreferences such as , and hexadecimal and Unicode character escapes.

Return value
The numeric value if indeed represents a digit in the currently imbued locale that is valid for the numeric base, or  on error.

Example
cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value cpp/regex/regex traits/value