Adding numbers in a string

Shell Programming and Scripting
1

I am writing a bash script on ubuntu11.10

I have some string having numbers and letter and want to add all the numbers together

For example

1s2d23f

I want to perform

1 + 2 + 23

and store it in a variable

2

one quick solution

s=`echo '1s2d23f' | sed 's:[a-zA-Z]:+0:g' | bc`
3

Here's another using awk:

var=$(echo "1s2d23f" | awk '{gsub(/[[:alpha:]]/, " ");for(i=1;i<=NF;i++) sum=sum+$i;print sum}')
4 
str=1s2d23f
var=$(( ${str//[^0-9]/+}0 ))