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Add TrimPrefix/TrimSuffix string extensions for segment-based trimming #87

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Merged
Tyrrrz merged 2 commits into from
Jul 16, 2026
Merged

Add TrimPrefix/TrimSuffix string extensions for segment-based trimming #87

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a0c9b63
Add TrimPrefix/TrimSuffix string extensions with tests
Copilot Jul 15, 2026
98b8262
Update StringExtensions.cs
Tyrrrz Jul 15, 2026
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29 changes: 29 additions & 0 deletions PowerKit.Tests/Extensions/StringExtensionsTests.cs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
using System;
using System.Text;
using FluentAssertions;
using PowerKit.Extensions;
Expand Down Expand Up @@ -128,6 +129,34 @@ public void ToSnakeCase_Test()
"".ToSnakeCase().Should().Be("");
}

[Fact]
public void TrimPrefix_Test()
{
// Act & assert
"hello world".TrimPrefix("hello").Should().Be(" world");
"hello world".TrimPrefix("world").Should().Be("hello world");
"hello world".TrimPrefix("").Should().Be("hello world");
"hello".TrimPrefix("hello").Should().Be("");
"HELLO world".TrimPrefix("hello", StringComparison.OrdinalIgnoreCase).Should().Be(" world");
"HELLO world".TrimPrefix("hello").Should().Be("HELLO world");
"".TrimPrefix("hello").Should().Be("");
"hello hello".TrimPrefix("hello").Should().Be(" hello");
}

[Fact]
public void TrimSuffix_Test()
{
// Act & assert
"hello world".TrimSuffix("world").Should().Be("hello ");
"hello world".TrimSuffix("hello").Should().Be("hello world");
"hello world".TrimSuffix("").Should().Be("hello world");
"hello".TrimSuffix("hello").Should().Be("");
"hello WORLD".TrimSuffix("world", StringComparison.OrdinalIgnoreCase).Should().Be("hello ");
"hello WORLD".TrimSuffix("world").Should().Be("hello WORLD");
"".TrimSuffix("world").Should().Be("");
"hello hello".TrimSuffix("hello").Should().Be("hello ");
}

[Fact]
public void Truncate_Test()
{
Expand Down
18 changes: 18 additions & 0 deletions PowerKit/Extensions/StringExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,24 @@ public SecureString ToSecureString()
/// </summary>
public string ToSnakeCase() => str.SeparateWords('_').ToLowerInvariant();

/// <summary>
/// Removes the specified prefix from the beginning of the string, if present.
/// If the string does not start with <paramref name="prefix"/>, the original string is returned unchanged.
/// </summary>
public string TrimPrefix(
string prefix,
StringComparison comparison = StringComparison.Ordinal
) => str.StartsWith(prefix, comparison) ? str[prefix.Length..] : str;

/// <summary>
/// Removes the specified suffix from the end of the string, if present.
/// If the string does not end with <paramref name="suffix"/>, the original string is returned unchanged.
/// </summary>
public string TrimSuffix(
string suffix,
StringComparison comparison = StringComparison.Ordinal
) => str.EndsWith(suffix, comparison) ? str[..^suffix.Length] : str;

/// <summary>
/// Truncates the string to the specified maximum number of characters.
/// </summary>
Expand Down