Regex \W inconsistency

[miloush]

Type of issue

Other (describe below)

Description

The \W language element is equivalent to the following character class [^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}\p{Lm}]

In other words, it matches any character except for those in the Unicode categories listed in the following table.

The table contains \p{Mn} but the equivalent class does not.

Page URL

https://learn.microsoft.com/en-us/dotnet/standard/base-types/character-classes-in-regular-expressions

Content source URL

https://github.com/dotnet/docs/blob/main/docs/standard/base-types/character-classes-in-regular-expressions.md

Document Version Independent Id

95abea42-fa7f-3feb-ae38-049719ab938f

Article author

@adegeo

Metadata

• ID: a1958bf6-a17d-1256-d659-31066aa02604
• Service: dotnet-fundamentals

Related Issues

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Associated WorkItem - 486555

[adegeo]

I'm not sure which is true. I can't seem to replicate it. can you? I was trying this to visualize what it marks, but I can't seem to get the grave accent to match.

using System.Text.RegularExpressions;

string pattern = @"[^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}\p{Lm}\p{Mn}]";
string source = "The old, grey mare slowly walked across the narrow, green ̀pasture.";
char[] chars = new string(' ', source.Length).ToCharArray();

Console.WriteLine(source);

foreach (Match match in Regex.Matches("The old, grey mare slowly walked across the narrow, green pasture.", pattern))
{
    for (int i = 0; i < match.Groups[0].Length; i++)
        chars[match.Groups[0].Index + i] = 'X';
}

Console.WriteLine(new string(chars));

[miloush]

Well, Regex.IsMatch("\u0300", "\\W") returns false, so the table is correct. The equivalent string is missing \p{Mn}