I am having trouble getting bash to match my regex

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Bash

I am learning bash scripting and I am trying to understand how regex works with bash. In my simple program, I have a file of various different lines but want to match a simple int pair with the format of the two numbers separated by a comma and a space as so: 123, 123. I also want to match the line with groups so I can easily extract the first and last numbers from the line. But when I pass a sample file to my program, it doesn't match any of the lines that I expect.

What I have tried:

#!/bin/bash

re="([0-9]+)(, )([0=9]+)"

echo $1
file1=$1

while IFS= read -r line; do
        echo "The line is: $line"
        if [[ $line =~ $re ]]; then
               echo ${BASH_REMATCH[0]};
               echo ${BASH_REMATCH[1]};
               echo ${BASH_REMATCH[2]};
        fi
done