Method findUTF8

java/com/google/re2j/RE2.java:616–622

(byte[] b)

   */
  // This is visible for testing.
  byte[] findUTF8(byte[] b) {
    int[] a = doExecute(MachineInput.fromUTF8(b), 0, UNANCHORED, 2);
    if (a == null) {
      return null;
    }
    return Utils.subarray(b, a[0], a[1]);
  }

  /**
   * Returns a two-element array of integers defining the location of the leftmost match in