Search Across Multiple Lines with Regex

Is it possible to search across multiple lines of text with regex in PoE? If so, what is the trick?

I am trying to isolate Temples of Atzoatl with an obstructed Apex. The item description text is as follows:

"

Obstructed Rooms:
Apex of Atzoatl

I have tried various iterations of "^Obs(.|\n)*Apex" with or without the "^" anchor or also including "|\r" or using a leading "(?s)", but I can't seem to find a way to search multiple lines. Can this be done in the PoE item search form? Is there a different way to go about ordered search such that the word 'Obstructed' must come before the word 'Apex'?