Java String utility Converts all decimal integers in a string to hex.

gistfile1.txt

  /** 
   * Converts all decimal numbers in a string to hex. 
   * @param src   The source string, possibly containing decimal numbers.
   * @return      The source string with all decimal numbers replaced by 
   *              their equivalent hex numbers.
   */
  public static String decimalInStringToHex(String src) {
    String result = "";
    int last = 0;
    
    Pattern regex = Pattern.compile("(?<!\\d)((?<![a-zA-Z])\\d+(?![a-zA-Z]))+");
    Matcher matcher = regex.matcher(src);
    while(matcher.find()) {
      long number = Long.parseLong(src.substring(matcher.start(), matcher.end()));
      String hex = Long.toString(number, 16);
      hex = "0x0" + hex.toUpperCase();
      
      result += src.substring(last, matcher.start()) + hex;
      last = matcher.end();
      
    }
    if(last < src.length()) {
      result += src.substring(last);
    }
    
    return result;
  }