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Fix Humanize behavior for fully uppercase input #1657

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Fix Humanize behavior for fully uppercase input #1657

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9cd9303
Fix Humanize behavior for fully uppercase input
ye-soling Dec 12, 2025
43dc933
Handle uppercase inputs with separators while preserving acronyms
ye-soling Dec 12, 2025
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11 changes: 7 additions & 4 deletions src/Humanizer/StringHumanizeExtensions.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
using System.Runtime.InteropServices;
using System.Linq;


namespace Humanizer;

Expand Down Expand Up @@ -90,10 +92,11 @@ static string FromPascalCase(string input)
public static string Humanize(this string input)
{
// if input is all capitals (e.g. an acronym) then return it without change
if (input.All(char.IsUpper))
{
return input;
}
if (input.All(char.IsUpper) &&
input.Any(c => c == ' ' || c == '_' || c == '-'))
{
input = input.ToLowerInvariant();
}

// if input contains a dash or underscore which precedes or follows a space (or both, e.g. freestanding)
// remove the dash/underscore and run it through FromPascalCase
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