Regular expression to capitalize first letter of words in sentence

[Shlomit Afgin]

Hi  


I need to write regular expression that will capitalize the first letter of 
each word in the string.  
Word should be string with length that is greater or equal to 3 letters  
exclude the words 'and' and 'the'. 


I tried: 
$string = lc($string); 
$string =~ s/\b(\w{3,}[(^the|^and)])\b/ucfirst($1)/ge; 
but it not working so well. 


Any ideas? 
Shlomit.