From: Michael Linfield <globyy3000@...>
Date: 2009-03-16T03:21:53+09:00
Subject: Re: Why do I need \b in regular expression?

Think of \b as the boundary of the words in a string.

\B has the opposite effect, affecting all letter/character boundaries 
instead of whole words.

string = "foo bar"
if you gsub this using \b, it will look like this:

string.gsub(/\b/,"-") #=> -foo- -bar-

As you can tell, it has added a "-" to only the boundaries (edges) of 
each word.

using \B will output this #=> f-o-o b-a-r

These are the inside boundaries of each word instead of the outside 
boundaries.
I hope this clarifies things a little.

Regards,

- Mac
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