       (" 123\n456\n", nil),
       ("123 456", "456"))
 
+    // FIXME: Keep this until _wordIndex and friends are
+#if os(Linux)
     firstMatchTests(
       #"\d+\b"#,
       ("123", "123"),

      ("Sol Cafe", nil), xfail: true)
  }

  func testLevel2WordBoundaries() {
    // MARK: Level 2 Word Boundaries
    firstMatchTest(#"\b😊\b"#, input: "🔥😊👍", match: "😊")

      xfail: true
    )

    // FIXME: Keep this until _wordIndex and friends are
#if os(Linux)
    // HTML tags
    matchTest(
      #"<([a-zA-Z][a-zA-Z0-9]*)\b[^>]*>.*?</\1>"#,
