When creating saved searches, you can divide a value of a field into components using REGEXP_REPLACE.
This is useful when trying to perform tasks like retrieving domain data for URL, retrieving the decimal part on a numeric value, etc.
In the sample above, (REGEXP_REPLACE('18.0.1', '(\d+)\.(\d+)\.(\d+)', '\2'), '18.0.1' is the input value (this can be replaced by a field ID), the dots (.) in between the '(\d+)' refer to the delimiter and the '2' in '\2' refers to the component that will be returned (the second component of the string in this case which is '0').