[LLVMbugs] [Bug 18514] New: regex doesn't use regex_traits::value() to parse quantifiers and backreferences

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18514

            Bug ID: 18514
           Summary: regex doesn't use regex_traits::value() to parse
                    quantifiers and backreferences
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: cubbimew at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Per C++ 28.13[re.grammar]/13, "Where the regular expression grammar requires
the conversion of a sequence of characters to an integral value, this is
accomplished by calling traits_inst.value."

Per ECMA-262, Quantifier includes DecimalDigits and DecimalEscape includes
DecimalIntegerLiteral, both of which are sequences of characters that are
converted to integral values.

in libc++, basic_regex::__parse_DUP_COUNT obtains the value of a quantifier by
executing *__first - '0', and basic_regex::__parse_BACKREF obtains its value by
executing *__temp - '0'.
(the \u and \x escapes, however, do call __traits_.value() as expected)

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