GREP Style Title Case Exceptions

[Jeff JL]

A couple years ago I found a set of GREP Styles to display text as title case (as described here), but still allow me to cross-reference it in sentence case. I can't seem to dig up where I had gotten it from, but putting it to work in a new document I found it capitalizing things it shouldn't, so I've started to revise the expressions to better reflect "proper" title casing. Originally posting here to seek assistance, I eventually scrapped together enough comprehension of GREP to fix it on my own. Here's what I came up with, maybe you know a better way?

Apply Style: All Caps (style only contains Case set to All Caps)
To Text: ^\S

Apply Style: All Caps
To Text: /\S

Apply Style: All Caps

To Text: :\s\l|[-\s]\l(?!(f|he|nd?|o|y|rom|or|r|ut)?\b)

Apply Style: Normal Case (style only contains Case set to Normal)

To Text: \s(a)\s|\s(an)\s|\s(and)\s|\s(are)\s|\s(but)\s|\s(down)\s|\s(in)\s|\s(is)\s|\s(of)\s|\s(on)\s|\s(or)\s|\s(the)\s|\s(to)\s|\s(up)\s|\s(up,)\s|\s(with)\s

[Jongware]

I think you can (rather vastly) simplify in the following way:

Apply All Caps to:

(?<!\w')\b\l

which means "word break, lower case, unless preceded by a word character and apostrophe" -- the latter to prevent "I'Ll Be Back".

Apply Normal to:

\b(a|an|the|it|of|with|at|from|into|during|including|until|against|among|throughout|despite|towards|upon|concerning|to|in|for|on|by|about|like|through|over|before|between|after|since|without|under|within|along|following|across|behind|beyond|plus|except|but|up|out|around|down|off|above|near)\b

which is the common definitie and indefinite articles, plus the 75-or-so most common prepositions, preceded and succeeded by a word break and separated by the vertical bar for OR.

Compare yours against mine: I can spot a few minor differences, such as "as", but the overall format of the GREP style is easy enough to add these if you want.

sample use

[I-Chen23476034nqdj]

Just what I was looking for, thank you!