Search in File for a character - out of the box module

Hi
I simply want to search in a file if there is at lease one occurance of “@” inside. An ansible module is prefered

I tried a little a bit with replace and lineinfile module and check the result variabel, but maybe there is a simpler out of the box way.

- name: replace
  replace: dest=test.properties
    regexp="@"
    replace="@"
    backup=yes
  register: result

no grep module yet, so "shell: grep .." is probably your best bet.