Applescript: Replace text handler

replace_handler.applescript

-- Replaces a substring with another substring
(*
set my_var to StringsLib's replace_text(some_text, "abc", "def")
*)
on replace_text(this_text, search_string, replacement_string)
	set prevTIDs to AppleScript's text item delimiters
	set AppleScript's text item delimiters to the search_string
	set the item_list to every text item of this_text
	set AppleScript's text item delimiters to the replacement_string
	set this_text to the item_list as string
	set AppleScript's text item delimiters to prevTIDs
	return this_text
end replace_text