Hello! Please help me solve the problem 
There are two people with the same last name in my company. I need to find all the tasks where one of them was tagged. But since their usernames are similar, JQL returns results for both employees.
Example: I need to find tasks where an employee with the login "smith" is mentioned. The JQL query looks like this: comments ~ smith
And this query returns results for both the employee with the login "smith" and the employee with the login "smith.am".
Search by token does not work, we do not have an ID, the operator !~ / brackets / quotation marks did not help either