Strip RTF to get the textual message.
e.g. 'Firstly: Do some thing. Secondly: Do another thing.' from:
{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
{\fonttbl\f0\fnil\fcharset0 Georgia;}
{\colortbl;\red255\green255\blue255;}
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural
\f0\b\fs32 \cf0 \expnd0\expndtw0\kerning0
Firstly:
\b0 \expnd0\expndtw0\kerning0
Do some thing.
\b \expnd0\expndtw0\kerning0
Secondly:
\b0 \expnd0\expndtw0\kerning0
Do another thing.}
{\rtf1\ansi\ansicpg1252\cocoartf949\cocoasubrtf430{\fonttbl\f0\fnil\fcharset0 LucidaGrande;}{\colortbl;\red255\green255\blue255;\red0\green0\blue0;}\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\qc\pardirnatural\f0\fs22 \cf2 WebView}
A Rich Text Formatted string from which to extract the string message.
"