diff --git a/Sources/SkipFoundation/String.swift b/Sources/SkipFoundation/String.swift
index e74830f..45910eb 100644
--- a/Sources/SkipFoundation/String.swift
+++ b/Sources/SkipFoundation/String.swift
@@ -88,6 +88,11 @@ extension String {
         return UrlEncoderUtil.decode(self, plusToSpace: true)
     }
 
+    public func range(of searchString: String) -> Range<String.Index>? {
+        let startIndex = indexOf(searchString)
+        return startIndex != -1 ? startIndex..<(startIndex + searchString.count) : nil
+    }
+
     public typealias Encoding = StringEncoding
 
     public var utf8Data: Data {
diff --git a/Tests/SkipFoundationTests/CoreLibs/TestString.swift b/Tests/SkipFoundationTests/CoreLibs/TestString.swift
new file mode 100644
index 0000000..a7f1066
--- /dev/null
+++ b/Tests/SkipFoundationTests/CoreLibs/TestString.swift
@@ -0,0 +1,14 @@
+// Copyright 2023–2025 Skip
+// SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
+import Foundation
+import XCTest
+
+class TestString : XCTestCase {
+    func test_rangeof() {
+        let str = "Hello, Skip!"
+        let rangeAll = str.range(of: str)
+        XCTAssertEqual(rangeAll, str.startIndex..<str.endIndex)
+        let rangeEL = str.range(of: "el")
+        XCTAssertEqual(rangeEL, str.index(str.startIndex, offsetBy: 1)..<str.index(str.startIndex, offsetBy: 3))
+    }
+}