Sub ColonUppercaseAll()
' Paul Beverley - Version 23.07.22
'  Changes the initial letter after every colon to lowercase

showHowMany = True

Set rng = ActiveDocument.Content
With rng.Find
  .ClearFormatting
  .Replacement.ClearFormatting
  .Text = "[a-zA-Z]: [a-z]"
  .Wrap = wdFindStop
  .Replacement.Text = ""
  .Forward = True
  .MatchWildcards = True
  .MatchWholeWord = False
  .Execute
End With

myCount = 0
Do While rng.Find.Found = True
  myCount = myCount + 1
  endNow = rng.End
  rng.MoveStart , 2
  rng.Text = UCase(rng.Text)
  If myCount Mod 50 = 0 Then rng.Select
  rng.Collapse wdCollapseEnd
  rng.Find.Execute
  DoEvents
Loop
Selection.HomeKey Unit:=wdStory
If showHowMany = True Then MsgBox "Changed: " & myCount
End Sub