Old Bold Rule

BoldRule.kt

// Matches: **This text should be bold.**
val PATTERN_BOLD = Pattern.compile("^\\*\\*([\\s\\S]+?)\\*\\*(?!\\*)")

class BoldRule : Parser.Rule(PATTERN_BOLD) {
  override fun parse(matcher: Matcher, parser: Parser): Node {
    val boldSpan = StyleSpan(Typeface.BOLD)
    
    // Recursively parse inside the **delimiters**
    val childNodes = parser.parse(matcher.group(1))
    return StyleNode(StyleSpan(Typeface.BOLD, childNodes))
  }
}