Android, parse and generate color, underline, bold style applied text

AndroidApplyTextStyle.java

  private final static String PATTERN_COLOR_REGEXP = "(<color=(.+?)>)(.+?)(</color>)";
  private final static Pattern PATTERN_COLOR = Pattern.compile(PATTERN_COLOR_REGEXP);

  private final static String PATTERN_BOLD_REGEXP = "(<b>)(.+?)(</b>)";
  private final static Pattern PATTERN_BOLD = Pattern.compile(PATTERN_BOLD_REGEXP);

  private final static String PATTERN_UNDERLINE_REGEXP = "(<u>)(.+?)(</u>)";
  private final static Pattern PATTERN_UNDERLINE = Pattern.compile(PATTERN_UNDERLINE_REGEXP);

  /**
   * parse and generate color, underline, bold style applied text
   * example: <![CDATA[hello <b><color=@user_name>%s</color></b>! <u><color=#ff00ff>welcome</color></u> ]]>
   *
   * @param text
   * @return
  */
  public static CharSequence applyStyle(Context context, String text) {
      SpannableStringBuilder ssb = new SpannableStringBuilder(text);

      //apply color
      Matcher colorMatcher = PATTERN_COLOR.matcher(text);
      while (colorMatcher.find()) {
          int colorVal = 0;
          String colorString = colorMatcher.group(2);
          if (colorString.startsWith("@")) {
              colorVal =
                      context.getResources().getColor(
                              context.getResources().getIdentifier(colorString.substring(1), "color", context.getPackageName()));
          } else {
              colorVal = Color.parseColor(colorString);
          }
          ForegroundColorSpan fgSpan = new ForegroundColorSpan(colorVal);

          ssb.setSpan(fgSpan, colorMatcher.start(3), colorMatcher.end(3), 0);
          ssb.delete(colorMatcher.start(4), colorMatcher.end(4));
          ssb.delete(colorMatcher.start(1), colorMatcher.end(1));

          text = text.replaceFirst(PATTERN_COLOR_REGEXP, colorMatcher.group(3));

          colorMatcher = PATTERN_COLOR.matcher(text);
      }

      //apply bold
      Matcher boldMatcher = PATTERN_BOLD.matcher(text);
      while (boldMatcher.find()) {
          StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);

          ssb.setSpan(boldSpan, boldMatcher.start(2), boldMatcher.end(2), 0);
          ssb.delete(boldMatcher.start(3), boldMatcher.end(3));
          ssb.delete(boldMatcher.start(1), boldMatcher.end(1));

          text = text.replaceFirst(PATTERN_BOLD_REGEXP, boldMatcher.group(2));

          boldMatcher = PATTERN_BOLD.matcher(text);
      }

      //apply underline
      Matcher underlineMatcher = PATTERN_UNDERLINE.matcher(text);
      while (underlineMatcher.find()) {
          ssb.setSpan(new UnderlineSpan(), underlineMatcher.start(2), underlineMatcher.end(2), 0);
          ssb.delete(underlineMatcher.start(3), underlineMatcher.end(3));
          ssb.delete(underlineMatcher.start(1), underlineMatcher.end(1));

          text = text.replaceFirst(PATTERN_UNDERLINE_REGEXP, underlineMatcher.group(2));

          underlineMatcher = PATTERN_UNDERLINE.matcher(text);
      }

      return ssb;
  }