Method substring

java/com/google/re2j/Matcher.java:382–394

Helper: return substring for [start, end).

(int start, int end)

  /** Helper: return substring for [start, end). */
  String substring(int start, int end) {
    // UTF_8 is matched in binary mode. So slice the bytes.
    if (matcherInput.getEncoding() == Encoding.UTF_8) {
      try {
        return new String(matcherInput.asBytes(), start, end - start, "UTF-8");
      } catch (UnsupportedEncodingException e) {
        throw new RuntimeException(e); // Not possible.
      }
    }

    // This is fast for both StringBuilder and String.
    return matcherInput.asCharSequence().subSequence(start, end).toString();
  }

  /** Helper for Pattern: return input length. */
  int inputLength() {