Find Specific String and place it in a variable

[booga73]

What would be the best option to find a string value in the output without placing the value into a text file?

for instance, I run the command:

tasklist /NH /FI "pid eq 4"

has the result:

System 4 Services 0 7,972 K

I would like to get the string value " 4 " set to a value.

[Squashman]

A FOR /F loop with the tokens=2.