There are many hex formats in which the hex prefixes must be removed, such as "0x" in order for C# TryParse function with NumberStyles.HexNumber to work.
UInt32.TryParse("0x20",
NumberStyles.HexNumber, // I've tried also AllowHexSpecifier
CultureInfo.InvariantCulture, // I've also tried CurrentCulture
out number));
The code below removes many hex formats prefixes as listed here - https://en.wikipedia.org/wiki/Hexadecimal
As per feedback, I improved the algo to first quarantine likely regex hex matches with prefixes then run another regex to extract the hex within that match.
As per feedback, I improved the algo to first quarantine likely regex hex matches with prefixes then run another regex to extract the hex within that match.
See my update - https://metadataconsulting.blogspot.com/2020/10/CSharp-dotNET-Get-integer-from-hexadecimal-string-many-hex-formats-supported-version-2.html
using System; using System.Globalization; using System.Text.RegularExpressions; public static class Program { const string strRegGetHexNumber = @"\\u[0-9a-f]{2,}|0x[0-9a-f]{2,}|%[0-9a-f]{2,}|\u0023([0-9a-f]){1,6}|&\u0023x([0-9a-f]){1,6};|\s[0-9a-f]{2,}|[0-9a-f]{2,}|[«‹»›„‚“‟‘‛”’""""❛❜❝❞〝〞〟"""""'‘][0-9a-f]{2,}[’'""""«‹»›„‚“‟‘‛”’""""❛❜❝❞〝〞〟"]"; private static readonly Regex rgxGetHex = new Regex(strRegGetHexNumber, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant); public static void Main() { string unicodeText = "UTF-16 (hex) 0x0023 (0023)"; //https://en.wikipedia.org/wiki/Hexadecimal --remove possible prefixes string prefixfree = string.Empty; string[] prefixHexs = new string[]{"0x", "\\u", "#", "&#", "\\x", "\\s", "U+", "X'", "16#", "#x", "#16r", "&H", "0h"}; foreach (var pre in prefixHexs) { if (unicodeText.IndexOf(pre) > -1) { prefixfree = unicodeText.Substring(unicodeText.IndexOf(pre) + pre.Length); break; } } if (string.IsNullOrEmpty(prefixfree)) prefixfree = unicodeText; Match m = rgxGetHex.Match(prefixfree); bool success = false; ulong number = 0; string hex_value = string.Empty; if (m.Success) { try { hex_value = m.Value; //long number = Convert.ToInt64(hex_value, 16); //base 16 - hex.... //https://stackoverflow.com/questions/2801509/uint32-tryparse-hex-number-not-working -> remove prefixes success = ulong.TryParse(hex_value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out number); } catch (FormatException) { unicodeText = string.Format("{0} is not in the correct format for a hexadecimal number.", m.Value); } catch (OverflowException) { unicodeText = string.Format("{0} is outside the range of an Int64.", m.Value); } catch (ArgumentException) { unicodeText = string.Format("{0} is invalid in base 16.", m.Value); } catch (Exception ex) { unicodeText = string.Format("{0} return error\r\n{2}", m.Value, ex.Message); } } else unicodeText = "Could not find a hex number in \"" + unicodeText + "\". Select the hex number only."; if (success) unicodeText = string.Format("{0} from found {1:N0} hex number in string {2}", number, hex_value, unicodeText); else unicodeText = "Could not find a hex number in \"" + unicodeText + "\". Select the hex number only."; Console.WriteLine(unicodeText); } }
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