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I try to use regexes in my bash script. I don't understand why the result of this simple example is "ko":

foo='bar'; if [[ $foo =~ '^[a-z]+$' ]] ; then echo "ok"; else echo "ko"; fi
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Remove both ':

foo='bar'; if [[ $foo =~ ^[a-z]+$ ]] ; then echo "ok"; else echo "ko"; fi
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