diff --git a/Sources/DiscogsService/Internal/Extensions/String+Functions.swift b/Sources/DiscogsService/Internal/Extensions/String+Functions.swift
new file mode 100644
index 000000000..abf2a7756
--- /dev/null
+++ b/Sources/DiscogsService/Internal/Extensions/String+Functions.swift
@@ -0,0 +1,45 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the DiscogsService open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the DiscogsService project authors
+// Licensed under Apache license v2.0
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of DiscogsService project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// ===----------------------------------------------------------------------===
+
+import Foundation
+
+extension String {
+    
+    // MARK: Functions
+    
+    /// Checks whether a regular expression pattern fully matches a string or not.
+    /// - Parameter pattern: A regular expression pattern to match a string against.
+    /// - Returns: A flag that indicates whether a given pattern fully matches a string or not.
+    func fullyMatch(pattern: String) -> Bool {
+        do {
+            if #available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 6.0, *) {
+                let securityInput = try Regex(pattern)
+                let matches = self.wholeMatch(of: securityInput)
+                
+                return matches != nil
+            } else {
+                let securityInput = try NSRegularExpression(pattern: pattern)
+                let matches = securityInput.matches(
+                    in: self,
+                    range: .init(location: 0, length: count)
+                )
+                
+                return !matches.isEmpty
+            }
+        } catch {
+            return false
+        }
+    }
+    
+}
diff --git a/Sources/DiscogsService/Internal/Validation Rules/SecureValidationRule.swift b/Sources/DiscogsService/Internal/Validation Rules/SecureValidationRule.swift
index 354b759a3..1873ed55a 100644
--- a/Sources/DiscogsService/Internal/Validation Rules/SecureValidationRule.swift	
+++ b/Sources/DiscogsService/Internal/Validation Rules/SecureValidationRule.swift	
@@ -77,32 +77,6 @@ private extension SecureValidationRule {
     
     // MARK: Functions
     
-    /// Checks if a given input is valid,
-    /// - Parameter input: An input to validate.
-    /// - Returns: A flag that indicates whether a given input is valid or not.
-    func isValid(_ input: String) -> Bool {
-        let regexPattern = String(format: .Pattern.securityInput, inputType.rawValue)
-
-        do {
-            if #available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 6.0, *) {
-                let securityInput = try Regex(regexPattern)
-                let matches = input.matches(of: securityInput)
-                
-                return !matches.isEmpty
-            } else {
-                let securityInput = try NSRegularExpression(pattern: regexPattern)
-                let matches = securityInput.matches(
-                    in: input,
-                    range: .init(location: 0, length: input.count)
-                )
-                
-                return !matches.isEmpty
-            }
-        } catch {
-            return false
-        }
-    }
-    
     /// Validates a given input.
     ///
     /// > note: This helper function would not be necessary when support for *Swift 5.10* is discontinued.
@@ -114,7 +88,10 @@ private extension SecureValidationRule {
         guard let input else {
             return false
         }
-        guard isValid(input) else {
+
+        guard input.fullyMatch(
+            pattern: .init(format: .Pattern.securityInput, inputType.rawValue)
+        ) else {
             switch inputType {
             case .consumerKey: throw InputValidationError.inputNotConsumerKey
             case .consumerSecret: throw InputValidationError.inputNotConsumerSecret
diff --git a/Tests/DiscogsService/Cases/Internal/Extensions/String+FunctionsTests.swift b/Tests/DiscogsService/Cases/Internal/Extensions/String+FunctionsTests.swift
new file mode 100644
index 000000000..78f756bc4
--- /dev/null
+++ b/Tests/DiscogsService/Cases/Internal/Extensions/String+FunctionsTests.swift
@@ -0,0 +1,99 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the DiscogsService open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the DiscogsService project authors
+// Licensed under Apache license v2.0
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of DiscogsService project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// ===----------------------------------------------------------------------===
+
+import Testing
+
+@testable import DiscogsService
+
+@Suite("String Functions", .tags(.extension))
+struct StringFunctionsTests {
+    
+    // MARK: Functions tests
+    
+#if swift(>=6.2)
+    @Test(arguments: zip(
+        Input.stringsToMatch,
+        Output.stringsToMatch
+    ))
+    func `fully match`(
+        string: String,
+        expects isMatch: Bool
+    ) {
+        assertFullyMatch(
+            string: string,
+            pattern: .Pattern.sample,
+            expects: isMatch
+        )
+    }
+#else
+    @Test("fully match", arguments: zip(
+        Input.stringsToMatch,
+        Output.stringsToMatch
+    ))
+    func fullyMatch(
+        string: String,
+        expects isMatch: Bool
+    ) {
+        assertFullyMatch(
+            string: string,
+            pattern: .Pattern.sample,
+            expects: isMatch
+        )
+    }
+#endif
+    
+}
+
+// MARK: - Assertions
+
+private extension StringFunctionsTests {
+    
+    // MARK: Functions
+    
+    /// Asserts the result of the `fullyMatch` function.
+    /// - Parameters:
+    ///   - string: A string to match against a pattern.
+    ///   - pattern: A regular expression pattern to match a string against.
+    ///   - isMatch: An expected flag that indicates whether there is a match or not.
+    func assertFullyMatch(
+        string: String,
+        pattern: String,
+        expects isMatch: Bool
+    ) {
+        // GIVEN
+        // WHEN
+        let result = string.fullyMatch(pattern: pattern)
+
+        // THEN
+        #expect(result == isMatch)
+    }
+    
+}
+
+// MARK: - Constants
+
+private extension Input {
+    /// A list of strings to match against a regular expression pattern in test cases.
+    static let stringsToMatch: [String] = ["Some Pattern", "Some", "Some Other Pattern", "Pattern", .empty]
+}
+
+private extension Output {
+    /// A list of expected results from matching a sample string against a sample regular expression pattern in test cases.
+    static let stringsToMatch: [Bool] = [true, false, false, false, false]
+}
+
+private extension String.Pattern {
+    /// A sample regular expression pattern to match against.
+    static let sample = "Some Pattern"
+}
diff --git a/Tests/DiscogsService/Types/Extensions/Tag+Customs.swift b/Tests/DiscogsService/Types/Extensions/Tag+Customs.swift
index 85184ee9c..6e41a6809 100644
--- a/Tests/DiscogsService/Types/Extensions/Tag+Customs.swift
+++ b/Tests/DiscogsService/Types/Extensions/Tag+Customs.swift
@@ -18,6 +18,9 @@ extension Tag {
     
     // MARK: Constants
     
+    /// A tag that indicates tests for a type extension.
+    @Tag static var `extension`: Self
+    
     /// A tag that indicates tests for a middleware type.
     @Tag static var middleware: Self