Replacing multiple spaces with a tab can be a nightmare, unless you know this simple Find and Replace trick.
Word processing has been around for a long time, and the techniques seem ingrained in our psyche. Yet every once in a while, I run across a document that uses multiple spaces instead of tabs to align text. The result is often a big mess. There are three ways to fix this problem:
I know which one I’d choose! To replace multiple and consecutive spaces with a single tab character, do the following:

The {2,} component tells Word to find two or more of the literal character, which in this case is a space character. You could use this component to find other multiple characters. The ^t component represents a single tab. To replace the spaces with more than one tab, simply add one ^t component for each additional tab.
Keep in mind that this technique will replace every occurrence of multiple and consecutive space characters, including some you might not want to replace with a tab. If you want to retain a legitimate occurrence of multiple spaces, select only the text that you want to run the Find and Replace task against before executing it. Or click Find Next so you can review the occurrence to decide whether you want to replace it or not.
This replace trick will work in any Office application, not just Word.