# Grab the word after matching word

    grep -oP "(?<=$word )[^ ]+"

For example, we wish to extract only `enp3s0` from the following output

    $ ip r show default
    default via 10.0.0.100 dev enp3s0 proto static metric 100

    $ word=dev
    $ ip r show default | grep -oP "(?<=$word )[^ ]+"
    enp3s0

# Bashrc entry

     grepWordAfter(){
        [[ -n $1 ]] && grep -Po "(?<=$1\s)\w+";
     }