Method isValidCaptureName

java/com/google/re2j/Parser.java:1151–1162

(String name)

  // Python rejects names starting with digits.
  // We don't enforce either of those.
  private static boolean isValidCaptureName(String name) {
    if (name.isEmpty()) {
      return false;
    }
    for (int i = 0; i < name.length(); ++i) {
      char c = name.charAt(i);
      if (c != '_' && !Utils.isalnum(c)) {
        return false;
      }
    }
    return true;
  }

  // parseInt parses a nonnegative decimal integer.
  // -1 => bad format.  -2 => format ok, but integer overflow.