Multiple color for same string in wp7

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C#

Hello All,
I am beginner to Windows phone Development .
I have defined string as below

string str = "[Basic settings:] bla bla bla"+
             "[Delete Settings:] bla bla bla"+
             "[Update Settings:] bla bla bla";
//this is a long string in same formate

<TextBlock Name="txtInfo" text="{Binding str}" Foreground="Yellow">

This works fine.All text in a textblock display "Yellow" colored text.
My Question :Is it possible to display a Text in "Red" which is surrounded by square brackets? and remaining in Yellow.
From above Example : [Basic settings:],[Delete Settings:],[Update Settings:] in Red
and all bla, bla ,bla are in Yellow ?

Thanks in advance!