You can use the special characters listed in the "More Information" section of this article with the Find and Replace commands on the Edit menu.
You want to replace
^l (typed literally - the
^ character does not indicate CTRL in this instance), and wildcards must be off for this to work.
To search and replace in just a selection of text rather than the entire document, select the text, bring up the search and replace dialog, and ensure "Current document down" is selected. Now when you click "replace all" it will only search inside the selected text and will prompt you before performing replacements on the rest of the document.