Is there a way to search for a list of strings, and for each match, put that string as the value of the same field?

Is there a way to search for a list of strings, and for each match, put that string as the value of the same field? edit: here's what I'm trying to do ie, "eval myField=( "value1", "value2", "value3") | stats count by myField" Where "value1", "value2", "value3" are literal strings. I want to get a count for how many "value1"s, "value2"s, and "value3"s there are