Try this. 

 $s ='the quick brown fox';
 $s =~ s/\b(\w+)\b/ucfirst  $1/ge;
 print $s;

[download]

Gives 

The Quick Brown Fox

[download]

Update: zigdon++ pointed out that your question showed the input as ALL UPPER CASE, which means that you would need

 $s =~ s/\b(\w+)\b/ucfirst lc $1/ge;.

Much safer.

Nah! Your thinking of Simon Templar, originally played by Roger Moore and later by Ian Ogilvy

In reply to Re: Changing case on a word boundary by BrowserUk
in thread Changing case on a word boundary by blue_cowdawg

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