title: Simple way of replacing a parts of NSMutableString/NSString
body: <p>I am new to iPhone development (using iOS 5) and I am trying to replace <code>:</code> with spaces in an NSMutableString. I have been struggling with this since an hour and it forces me to use 
  <code>replaceOccurrencesOfString:@":" withString:@" " options:nil range:;</code> (I thought I could use it without options and range). I have tried almost everything (especially for the <code>range</code> parameter) but it keeps complaining about various stuff such as <code>bad receiver type</code>. </p>
  
  <p>Any suggestions about how to achieve this?</p>