private static
  java.util.regex.Pattern
      fpPattern() {
    /*
     * We use # instead of * for possessive quantifiers. This lets us strip them out when building
     * the regex for RE2 (which doesn't support them) but leave them in when building it for
     * java.util.regex (where we want them in order to avoid catastrophic backtracking).
     */
    String decimal = "(?:\\d+#(?:\\.\\d*#)?|\\.\\d+#)";

    TensorBoard, no longer that useful). It remains in history should someone
    find the code useful.
*   re2 / regexp.h was removed from being a public interface of TF. Should users
    need regular expressions, they should depend on the RE2 library directly
    rather than via TensorFlow.

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