sh/bash try/catch on error message grep

try.sh

#!/bin/sh
# Attempt command, printing all output to stdout, catching errors 
# based on a regex, erroring out on all other errors
if output=`some-command 2>&1`
then
  echo "$output"
else
  if echo "$output" | grep 'regex string'
  then
    something --other --than bailing
  else
    echo "$output"
    exit 1
  fi
fi