1st substitute/([A-Z][a-z][\W][\b])/<userinput>/;

##</code><code>##

then
2nd substitute/(NOT THIS ONE[A-Z][a-z][\W][\b])(THIS ONE[A-Z][a-z][\W][\b])/<userinput>/;

##</code><code>##

then
3rd substitute/(NOT THIS ONE[A-Z][a-z][\W][\b])(AND NOT THIS ONE[A-Z][a-z][\W][\b])(BUT THIS ONE[A-Z][a-z][\W][\b])/<userinput>/;