Bash Regular Expression — Can’t seem to match any of \s \S \d \D \w \W etc

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Perhaps \S and \s are not supported, or that you cannot place them around [ ]. Try to use the following regex instead:

^Disk[[:space:]]+/dev[^[:space:]]+:[[:space:]]+[^[:space:]]+

EDIT

It seems like you actually want to get the matching fields. I simplified the script to this for that.

#!/bin/bash 

regex='^Disk[[:space:]]+(/dev[^[:space:]]+):[[:space:]]+(.*)'

while read line; do
    [[ $line =~ $regex ]] && echo "${BASH_REMATCH[1]} matches ${BASH_REMATCH[2]}."
done < disks.txt

Produces:

/dev/sda matches 42.9GB.
/dev/sdb matches 42.9GB.

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