How to count the number of characters in each line of a file, excluding a list of specific characters?

Question

How can I count how many characters appear within a file, minus those from a specific list. Here is an example file:

你好吗？
我很好，你呢？
我也很好。

I want to exclude any occurrences of ？, ，, and 。 from the count. The output would look like this:

3
5
4

Answer 1

A pure bash solution:

while IFS= read -r l; do
    l=${l//[？，。]/}
    echo "${#l}"
done < file

Answer 2

Try

sed 's/[，。？]//g' file | perl -C -nle 'print length'

The sed part removes unwanted characters, and the perl part counts the remaining characters.