```
params=$(echo "$params_untrimmed" | sed 's/^[ \t,]*//')
```
Can't rewrite this #bash expression to string substitution form (`${}`).
Can someone do that?
@jonn
shopt -s extglob
params=${params_untrimmed##*([,[:space:]])}
Follow
@mushidango I keep forgetting what do these `shopts` do...
