number of occurences of a word in a part of file in vim

Question

Suppose I would like to find the number of occurrences of the word 'asd' in a part of file, eg., from line 21 to line 234. How would I do that in VIM?

Answer 1

Try this for counting :21,234s/asd//gn

Edit

Since your vim is so old, try greping and count like

sed -n 21,234p filename | grep -o asd | wc -l