Bash "=~" example

$ [[ 45 =~ [0-9]+ ]] && echo "45 contains digits"
45 contains digits

$ [[ "hello" =~ [0-9]+ ]] && echo "hello doesnt contains digits"
$ [[ "hello" =~ [a-z]+ ]] && echo "hello contains alphabets"
hello contains alphabets

Source: stackoverflow.com

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