Re: Testing numeric data

[hancooper]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, August 23, 2021 12:13 AM, Dennis Williamson 
<dennistwilliamson@gmail.com> wrote:

> On Sun, Aug 22, 2021, 7:03 PM hancooper via <help-bash@gnu.org> wrote:
>
>> I have the following code that determines if a number in numeric.
>>
>> But when I use
>>
>> frmt="flp" and `$1` set to `5.3`.
>>
>> `k` is still `0`
>>
>> # floating point numbers in fixed-point format
>> local flp='^[-+]?[0-9]*[.,]?[0-9]+$'
>> local pvflp='^+?[0-9]*[.,]?[0-9]+$'
>> local ngflp='^-[0-9]*[.,]?[0-9]+$'
>>
>> # floating point numbers in exponential format
>> local flpe='^[-+]?[0-9]*[.,]?[0-9]+(?:[eE][-+]?[0-9]+)?$'
>> local pvflpe='^+?[0-9]*[.,]?[0-9]+(?:[eE][-+]?[0-9]+)?$'
>> local ngflpe='^-[0-9]*[.,]?[0-9]+(?:[eE][-+]?[0-9]+)?$'
>>
>> declare -i k=0
>> case $frmt in
>> ("flp") [[ "$1" =~ "$flp" ]] && k=1 ;;
>> ("pvflp") [[ "$1" =~ "$pvflp" ]] && k=1 ;;
>> ("ngflp") [[ "$1" =~ "$ngflp" ]] && k=1 ;;
>> ("flpe") [[ "$1" =~ "$flpe" ]] && k=1 ;;
>> ("pvflpe") [[ "$1" =~ "$pvflpe" ]] && k=1 ;;
>> ("ngflpe") [[ "$1" =~ "$ngflpe" ]] && k=1 ;;
>> (*) [[ "$1" =~ "$flp" ]] && k=1 ;;
>> esac
>>
>> echo "$k"
>
> Quoting the right side of the match changes it to an equality relationship 
> rather than a regex match. Try
>
> ("flp") [[ "$1" =~ $flp ]] && k=1 ;;

You are quite right Dennis. Thank you.