diff --git a/Sources/XcbeautifyLib/CaptureGroups.swift b/Sources/XcbeautifyLib/CaptureGroups.swift
index 6d1d04a3..f0cd2d16 100644
--- a/Sources/XcbeautifyLib/CaptureGroups.swift
+++ b/Sources/XcbeautifyLib/CaptureGroups.swift
@@ -10,11 +10,6 @@ package extension CaptureGroup {
     var outputType: OutputType { Self.outputType }
 }
 
-extension CaptureGroup {
-    static var pattern: String { regex.pattern }
-    var pattern: String { Self.regex.pattern }
-}
-
 protocol ErrorCaptureGroup: CaptureGroup {
     var wholeError: String { get }
 }
diff --git a/Sources/XcbeautifyLib/XCRegex.swift b/Sources/XcbeautifyLib/XCRegex.swift
index 5cc32f46..bcd57e2e 100644
--- a/Sources/XcbeautifyLib/XCRegex.swift
+++ b/Sources/XcbeautifyLib/XCRegex.swift
@@ -3,7 +3,7 @@ import Foundation
 // `NSRegularExpression` is marked as `@unchecked Sendable`.
 // Match the definition here.
 package final class XCRegex: @unchecked Sendable {
-    let pattern: String
+    private let pattern: String
 
     private lazy var regex: NSRegularExpression? = {
         let regex = try? NSRegularExpression(pattern: "^" + pattern, options: [.caseInsensitive])