bash allow only positive integer or positive integer with decimal point

Question

price=\"1.11\"
case $price in
            \'\'|*[!0-9]*) echo \"It is not an integer.\";
            ;;
        esac

Output: It is not an integer

Answer 1

Try this regular expression ^(0*[1-9][0-9]*(\.[0-9]+)?|0+\.[0-9]*[1-9][0-9]*)$