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⚡ Optimize StringDehumanizeExtensions with compiled Regex #84

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Merged
winnerspiros merged 1 commit into from
Feb 14, 2026
Merged

⚡ Optimize StringDehumanizeExtensions with compiled Regex #84

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14 changes: 10 additions & 4 deletions osu.Game/Extensions/StringDehumanizeExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,11 @@ namespace osu.Game.Extensions
/// </summary>
public static class StringDehumanizeExtensions
{
private static readonly Regex pascal_case_regex = new Regex(@"(?:^|_|-| +)(.)", RegexOptions.Compiled | RegexOptions.CultureInvariant);
private static readonly Regex snake_case_step1_regex = new Regex(@"([\p{Lu}]+)([\p{Lu}][\p{Ll}])", RegexOptions.Compiled | RegexOptions.CultureInvariant);
private static readonly Regex snake_case_step2_regex = new Regex(@"([\p{Ll}\d])([\p{Lu}])", RegexOptions.Compiled | RegexOptions.CultureInvariant);
private static readonly Regex snake_case_step3_regex = new Regex(@"[-\s]", RegexOptions.Compiled | RegexOptions.CultureInvariant);

/// <summary>
/// Converts the string to "Pascal case" (also known as "upper camel case").
/// </summary>
Expand All @@ -46,7 +51,7 @@ public static class StringDehumanizeExtensions
/// </example>
public static string ToPascalCase(this string input)
{
return Regex.Replace(input, "(?:^|_|-| +)(.)", match => match.Groups[1].Value.ToUpperInvariant());
return pascal_case_regex.Replace(input, match => match.Groups[1].Value.ToUpperInvariant());
}

/// <summary>
Expand All @@ -60,6 +65,7 @@ public static string ToPascalCase(this string input)
public static string ToCamelCase(this string input)
{
string word = input.ToPascalCase();

return word.Length > 0 ? char.ToLowerInvariant(word[0]) + word.Substring(1) : word;
}

Expand All @@ -73,9 +79,9 @@ public static string ToCamelCase(this string input)
/// </example>
public static string ToSnakeCase(this string input)
{
return Regex.Replace(
Regex.Replace(
Regex.Replace(input, @"([\p{Lu}]+)([\p{Lu}][\p{Ll}])", "$1_$2"), @"([\p{Ll}\d])([\p{Lu}])", "$1_$2"), @"[-\s]", "_").ToLowerInvariant();
return snake_case_step3_regex.Replace(
snake_case_step2_regex.Replace(
snake_case_step1_regex.Replace(input, "$1_$2"), "$1_$2"), "_").ToLowerInvariant();
}

/// <summary>
Expand Down