30 Regular expressions library [re]

30.6 Class regex_­error [re.badexp]

class regex_error : public runtime_error {
public:
  explicit regex_error(regex_constants::error_type ecode);
  regex_constants::error_type code() const;
};
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The class regex_­error defines the type of objects thrown as exceptions to report errors from the regular expression library.
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regex_error(regex_constants::error_type ecode);
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Postconditions: ecode == code().
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regex_constants::error_type code() const;
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Returns: The error code that was passed to the constructor.