Batch find and replace non-breaking spaces

About the non-breakable space, you can use this string in the Find what box:
(\d)[followed by a space]

and this string in the Replace with box:
$1[followed by non-breakable space, i.e., ALT+0160]

Note: Texts in brackets and square brackets themselves ([])are just descriptive. You have to remove them and replace them with spaces that I can't show here.

Tick Use and select Regular expressions.

The press the Replace button for each instance with wish to get replaced.

Of course, you can try with other search and replace patterns, like:
Find what: (\d) (mg)
Replace with: $1[ALT+0160]$2


Non-breaking hyphen:
Alt +2011