With the standard find & replace dialog you can look and replace for simple text in the file being edited. While the dialog is open, you can also edit the script. Selecting the command at menu Search / Find again, will find the next match after the cursor position.
Whether the case of the text to find will matter while matching
Whole words only
Whether the text to find will be a part of a word or must be a whole word
Enables very simple metacharacters for the find text, like
$ ^ + ? .
It also enables the replacement text to contain the metacharacters:
\n New line
Do not enter more complex regular expressions here. The Pattern search / replace dialog is better and has more functionality.
Prompt on replace
If you have enabled replace, then you will be prompted for each replacement.
Search text either in a forward direction or backwards.
Whether to confine the search in the selected block or the entire file
Begin the search from the cursor position or from either the selected block or the entire file (depending on scope)