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~ubuntu-branches/ubuntu/trusty/bash/trusty-security 

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# expansions involving patterns

var='[hello'
echo "${var//[/}"

red='\[\e[0;31m\]'
echo "${red//\\[\\e/}"

foo="${red//\\[\\e/}"

# foo == [0;31m\]
echo "${foo//[0;31m\\/}"

echo "${var//[]/}"
echo "${red//[]/}"

v=hello
foo='[:alpha:]'

echo ${v//[[:alpha:]]/}
echo ${v//[[:alpha]]/}
echo ${v//[[:alpha]/}