Implement range, lipsum, unique

HELP.txt

@@ -72,8 +72,15 @@ lines [<on>] [<join>]
 join [<with>]
     Join separate lines in the string using the given <with> separator.
 
-replace <find> <replace>
+replace <find> <replace> [<range>]
     Replace all instances of <find> with <replace>.
+    Optionally, define a "range pattern" to replace. Range patterns define
+    the nth occurrences of <find> that should be replaced. The last number
+    in a range will be repeated as necessary.
+    Example:
+        "First Name Last Name Salutation Age Height"
+        replace ' ' , [2, 2, 1]
+        "First Name,Last Name,Salutation,Age,Height"
 
 lsub <offset> [<length>]
     Replace the current string with a substring from the left, starting at <offset>.