I can't get my head around regular expressions! Help me please before I go mad!
 
I need to replace one word with another, matching cases (if possible), but in a smart 
way. eg.
 
"Ben lives in benland. But ben is actually not called ben. He's called ben-dabble"
 
Say I want to replace 'ben' (any case) with 'mike', I would like to get:

"Mike lives in benland. But mike is actually not called mike. He's called mike-dabble"
 
Note the punctuation - I only want whole words, or words which are surrounded by 
punctuation. Does that make sense?
 
I know I'm asking a lot but doing it using normal code and replace() is a slow 
operation. Even a reg-ex which will just replace whole words (including if they're at 
the beginning or end of a string) would be fantastic. I could do 2 regexs to do the 
case-matching, if it's not possible to do it in 1.
 
Many Thanks!




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