How to replace a character in a string

Hello Powerusers
First i'me new in the applescripting so hope you can tell me a few hint to get on.
I Have been trying to find a way to replace characters in a string using applescript. but with no luck
Anybody having a script that can give me a clue on this.
I'me normally programming in windows.... yeah i know there is a first time for everything.

Okay i solved my problem but why arent the folder renamed?
property oldfolder : ""
property newfolder : ""
property SS : "."
property RS : " "
to replaceText(someText, oldItem, newItem)
     replace all occurances of oldItem with newItem
          parameters -     someText [text]: the text containing the item(s) to change
                    oldItem [text, list of text]: the item to be replaced
                    newItem [text]: the item to replace with
          returns [text]:     the text with the item(s) replaced
          set {tempTID, AppleScript's text item delimiters} to {AppleScript's text item delimiters, oldItem}
          try
                    set {itemList, AppleScript's text item delimiters} to {text items of someText, newItem}
                    set {someText, AppleScript's text item delimiters} to {itemList as text, tempTID}
          on error errorMessage number errorNumber -- oops
                    set AppleScript's text item delimiters to tempTID
                    error errorMessage number errorNumber -- pass it on
          end try
          return someText
end replaceText
tell application "Finder"
          set these_items to the selection
end tell
repeat with i from 1 to the count of these_items
          set this_item to (item i of these_items) as alias
          set this_info to info for this_item
          set oldfolder to name of this_info
          set newfolder to replaceText(oldfolder, SS, RS)
          set name of this_info to newfolder
end repeat

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Known is a DROP, Unknown is an OCEAN.

How to replace a character in a string

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