Check if a string is UUID using UUID.init(uuidString:)

Tests/WordPressKitTests/Tests/Utilities/URLSessionHelperTests.swift

@@ -319,12 +319,9 @@ class URLSessionHelperTests: XCTestCase {
  // This functions finds temp files that are used for uploading multipart form.
  // The implementation relies on an internal implementation detail of building multipart form content.
  private func existingMultipartFormTempFiles() throws -> Set<String> {
- let uuidRegex = try NSRegularExpression(pattern: "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89ab][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$")
  let fm = FileManager.default
  let files = try fm.contentsOfDirectory(atPath: fm.temporaryDirectory.path)
- .filter {
- uuidRegex.numberOfMatches(in: $0, range: NSMakeRange(0, $0.count)) == 1
- }
+ .filter { UUID(uuidString: $0) != nil }
  return Set(files)
  }