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# expansions involving patterns
var='[hello'
echo "${var//[/}"
red='\[\e[0;31m\]'
printf "%s\n" "${red//\\[\\e/}"
foo="${red//\\[\\e/}"
# foo == [0;31m\]
printf "%s\n" "${foo//[0;31m\\/}"
echo "${var//[]/}"
echo "${red//[]/}"
v=hello
foo='[:alpha:]'
echo ${v//[[:alpha:]]/}
echo ${v//[[:alpha]]/}
echo ${v//[[:alpha]/}
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