I've done v4 with a delta patch.

Decided to standardize on calling the SQL Similar To regular expression escape replaceable "escape" everywhere.

Instead of fully documenting the obsolete syntax I added a note explaining the keyword choice difference.  Removed mention of it completely from the Pattern Matching portion of the documentation - that section has enough going on.

I also add "Same as" references for the two pairs of entries.  Not married to them but they do seem warranted; having Pattern Matching be required reading to make that connection seems undesirable.

David J.