#!/bin/bash
link='<https://a...content-available-to-author-only...e.com/v1/monitor/zzsomeLongIdzz?access_token=xxSomeLongTokenxx==>; rel="monitor",<https://a...content-available-to-author-only...e.com/v1/services/xx/something-more/accounts/2345?access_token=xxSomeLongTokenxx==>; rel="parent"'
re=",<([^>]+)>"
my_url="test"
if [[ $link =~ $re ]]; then my_url=${BASH_REMATCH[1]}; fi
echo $my_url
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