Using LOOKUP to insert a Regex string - is it possible?

[ipicbc]

I want to insert a different regex string into my query for each host. I am thinking that a way to achieve this is by making a lookup into a CSV to retrieve the regex string, allocating to a new field, and then inserting it further on in the query.

Is this possible or ridiculous?

Thanks for your advice

[martin_mueller]

That's entirely possible. Say your lookup looks like this:

host,expression
A,foo
B,bar

Add your lookup to your data as automatic, and search like this:

base search | where match(some_field, expression)

That would filter to only keep events where the host-based expression matches some_field.

[martin_mueller]

expression is the field produced by the automatic lookup.

[ipicbc]

Thanks. How would I get the regex statement into expression?