Find and replace text in an opened TextEdit document using AppleScript.

textedit_find_replace.applescript

-- Find and replace a single word in an opened TextEdit document
tell application "TextEdit"
  make new document
	
	-- Add some text to the document
	set text of front document to "The quick fox jumped over the lazy dog."
	
	-- Find and replace
	set every word of front document where it = "fox" to "elephant"
end tell

-- Find and replace a phrase in a TextEdit document
tell application "TextEdit"
	make new document
	
	-- Add some text to the document
	set text of front document to "The quick fox jumped over the lazy dog."
	
	-- Find and replace
	set text of front document to replace_chars(text of front document, "quick fox", "slow elephant") of me
end tell

on replace_chars(this_text, search_string, replacement_string)
	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 ""
	return this_text
end replace_chars

Thank you, can you tell me, but how to add a word at the end of the name, wherever there is a .bin format
eg red_1.bin but need red_1_low.bin

First, you can probably do this in Finder without writing a script. Select the files and choose File > Rename.

If you do want to do this with a script, I suggest taking a look at some of the chapters about working with files/folders and text in the Mac Automation Scripting Guide.

https://developer.apple.com/library/archive/documentation/LanguagesUtilities/Conceptual/MacAutomationScriptingGuide/ReferenceFilesandFolders.html#//apple_ref/doc/uid/TP40016239-CH34-SW1

https://developer.apple.com/library/archive/documentation/LanguagesUtilities/Conceptual/MacAutomationScriptingGuide/ManipulateText.html#//apple_ref/doc/uid/TP40016239-CH33-SW1