System.Data.Common.EntitySql.CqlLexer.IsDigit(char)

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private static bool isHexDigit(char c)
        {
            return (IsDigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'));
        }

internal static bool IsLetterOrDigitOrUnderscore(string symbol, out bool isIdentifierASCII)
        {
            isIdentifierASCII = true;
            for (int i = 0; i < symbol.Length; i++)
            {
                isIdentifierASCII = isIdentifierASCII && symbol[i] < 0x80;
                if (!isIdentifierASCII && !IsLetter(symbol[i]) && !IsDigit(symbol[i]) && (symbol[i] != '_'))
                {
                    return false;
                }
            }
            return true;
        }