I am looking for a way to search a file for a specific pattern '.00' and want to calculate how often it appears. grep -o '.00' file does this quite well. Unfortunately I do not know how to exclude any pattern which contains the pattern I want to have but is a longer string.

What I want to have :

number of times, '.00' appears in the file

What I want to exclude :

longer patterns like '0.000001' so everything '*.00*'

Does anybody have an idea? Could I do something like "grep -o ('.00' and not '*.00*') ?

Thanks in advance, advice and boosting appreciated.

@IntegralDuChemin do it like this

something | grep ".00" | grep -v ".00*"