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pkg regexp/syntax, const ErrMissingParen = "missing closing )"
pkg regexp/syntax, const ErrMissingRepeatArgument = "missing argument to repetition operator"
pkg regexp/syntax, const ErrTrailingBackslash = "trailing backslash at end of expression"
pkg regexp/syntax, const ErrUnexpectedParen = "unexpected )"
pkg regexp/syntax, const ErrUnexpectedParen ErrorCode
pkg regexp/syntax, const FoldCase = 1