I have read about using “other options” and “regular expressions” in Find & Replace, and using “$” in the find field to find “new paragraph” - but what do I put in the replace field to create tabs?
Put there \t.
From the help topic:
\t Represents a tab. You can also use this expression in the Replace box.
Caution! Built-in “Find & Replace” acts only on a paragraph content, excluding the paragraph mark. $ means paragraph end, not “new paragraph”. Consequently, you can’t replace the paragraph mark, with one exception: ^$ represents an empty paragraph and can be replaced or deleted.
In the replace field, \t stands for a tab.
To extend find & replace possibilities, consider the Alternate Search extension which is able to grab more then a single paragraph content.
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Please note that $ alone is another exception from “only on a paragraph content, excluding the paragraph mark” rule.
From help:
$ on its own matches the end of a paragraph. This way it is possible to search and replace paragraph breaks.