busybox sed captures space from expression with ^\s

[Leon Busch-George]

echo '8.8.8.8 via 192.168.0.1 dev br-n_1 src 192.168.0.37 uid 0  cache ' | sed -nE 's/^.*dev\s*([^\s]*).*$/\1/p' | hexdump -C
00000000  62 72 2d 6e 5f 31 20 0a                           |br-n_1 .|
00000008

Changing the capture to ([^ \s]*) removes the space from the output.

This is with Busybox 1.36.0 from Openwrt.