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This escape process must include handling for multi-line strings pattern.

I think you're barking up the wrong tree. If you're trying to match a multiline pattern then the most significant problem is not how to escape the pattern, but rather how to write a sed script that will successfully match anything to it.

The problem is that sed reads input one line at a time. There are various ways to collect multiple lines and to operate on such collections, but you need to do that explicitly in the program. sed is therefore a poor choice for attempting to match arbitrary multiline text. To make your task feasible, you would want to know how many lines the pattern will contain, so as to write your sed program to be specific for that. Even then, this might be a better job for Perl.

Update:

Because I like sed, however, here's an example of how you could write a sed program that matches multiline patterns:

Thanks to user oowowaee from previous linked question, who suggested overriding the Story serializer's chapters field (which I didn't know you could do that), the code is working now and the records don't get deleted from database.

You do not have any input called input$location_description

It should be

plotData <- subset(zones, pressure_zone_name==input$zones & location_description==input$sampleLocation)

instead of

plotData <- subset(zones, pressure_zone_name==input$zones & location_description==input$location_description)

EDIT

Sorry for missing out the main point of the question.Since availablelocations is a data.frame your updateSelectInput should be as follows :