I want to export Text inside bubble from P&ID PDF to excel format so that I can easily inlist all tags to save time.is there any specific way or by scripting in bluebeam revu software?
This sounds like a request to export your markups. If you filter your makrup list for just your desired markups (this is easier if your markups have something descriptive in the subject field) then use markup>export
In this example I have two markups with text. the first one has text on three lines (carriage returns) and the second has a single line. The markup export will drop the comment field into excel. from there you can trim and polish your text as you need.
If you are asking to export exisitng content on the drawing, this is something that can be done quickly from CAD. You can likely set up something in Bluebeam to grab the existing content info but the reliability will be lower. Three lines of text in a bubble may not export together as the text layout in a PDF is not the same as the dwg file.