#!/bin/bash
s='yellow abc \
yellow_x abc \
yellow_y acc \
blue abb \
pink abb \
pink_xx acd \'
awk '$1 == "yellow_y"{print $2}' <<< "$s"
IyEvYmluL2Jhc2gKcz0neWVsbG93ICAgICAgYWJjIFwKeWVsbG93X3ggICAgIGFiYyBcCnllbGxvd195ICAgICAgYWNjIFwKYmx1ZSAgICAgYWJiIFwKcGluayBhYmIgXApwaW5rX3h4IGFjZCBcJwphd2sgJyQxID09ICJ5ZWxsb3dfeSJ7cHJpbnQgJDJ9JyA8PDwgIiRzIg==