Test for valid characters in .NET regex named capturing group name | C# Online Compiler

Test for valid characters in .NET regex named capturing group name by Marathon55

using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;

public class Program
{
	public static void Main()
	{
		List<string> listOfNonPunctuationCharacters = new List<string>();
		for (int i = 0; i < 128; i++)
		{
			//if(!Regex.IsMatch(((char)i).ToString(),"(?i)[a-z0-9]"))
			//Console.WriteLine((char)i + ": " + char.IsPunctuation((char)i));	
			if (char.IsPunctuation((char)i))
				listOfNonPunctuationCharacters.Add(((char)i).ToString());
		}

		string groupName;
		foreach (string character in listOfNonPunctuationCharacters)
		{
			groupName = "group" + character + "name";
			try
			{
				Console.WriteLine("groupName: " + groupName);
				Regex r = new Regex("123 (?<" + groupName + ">ABC) 123");
				Match m = r.Match("123 ABC 123");
				Console.WriteLine("Captured group: " + m.Groups[groupName].Value);
			}
			catch (Exception e)
			{
				Console.WriteLine(e.Message.ToString());
			}
		}
	}
}

​x
 
using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
​
public class Program
{
    public static void Main()
    {
        List<string> listOfNonPunctuationCharacters = new List<string>();
        for (int i = 0; i < 128; i++)
        {
            //if(!Regex.IsMatch(((char)i).ToString(),"(?i)[a-z0-9]"))
            //Console.WriteLine((char)i + ": " + char.IsPunctuation((char)i));  
            if (char.IsPunctuation((char)i))
                listOfNonPunctuationCharacters.Add(((char)i).ToString());
        }
​
        string groupName;
        foreach (string character in listOfNonPunctuationCharacters)
        {
            groupName = "group" + character + "name";
            try
            {
                Console.WriteLine("groupName: " + groupName);
                Regex r = new Regex("123 (?<" + groupName + ">ABC) 123");
                Match m = r.Match("123 ABC 123");
                Console.WriteLine("Captured group: " + m.Groups[groupName].Value);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message.ToString());
            }
        }
    }
}

groupName: group!name
parsing "123 (?<group!name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group"name
parsing "123 (?<group"name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group#name
parsing "123 (?<group#name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group%name
parsing "123 (?<group%name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group&name
parsing "123 (?<group&name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group'name
parsing "123 (?<group'name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group(name
parsing "123 (?<group(name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group)name
parsing "123 (?<group)name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group*name
parsing "123 (?<group*name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group,name
parsing "123 (?<group,name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group-name
parsing "123 (?<group-name>ABC) 123" - Reference to undefined group name name.
groupName: group.name
parsing "123 (?<group.name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group/name
parsing "123 (?<group/name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group:name
parsing "123 (?<group:name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group;name
parsing "123 (?<group;name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group?name
parsing "123 (?<group?name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group@name
parsing "123 (?<group@name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group[name
parsing "123 (?<group[name>ABC) 123" - Unterminated [] set.
groupName: group\name
parsing "123 (?<group\name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group]name
parsing "123 (?<group]name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group_name
Captured group: ABC
groupName: group{name
parsing "123 (?<group{name>ABC) 123" - Invalid group name: Group names must begin with a word character.
groupName: group}name
parsing "123 (?<group}name>ABC) 123" - Invalid group name: Group names must begin with a word character.

Cached Result
Last Run:	3:28:40 am
Compile:	0.11s
Execute:	0s
Memory:	104kb
CPU:	0s

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