Here is a script that searches the Text Content of selected EagleFiler records for hashtags (’#’ followed by other characters) and adds them as EagleFiler tags without the ‘#’. ‘#’ by itself or ‘##’, ‘###’, etc. are ignored.
-- find hastags in text file and add as tags to eaglefiler
-- C. Dunn 5/29/19
-- Based on Tag Examples
-- https://c-command.com/scripts/eaglefiler/tag-examples
-- Summary: converts hashtags to EagleFiler tags
-- Requires: EagleFiler
-- Install Location: ~/Library/Scripts/Applications/EagleFiler/
-- Last Modified: 2011-09-23
tell application "EagleFiler"
set _theSelection to selected records of browser window 1
repeat with _record in _theSelection
set _text to text content of _record
-- the 'sed' call gets rid of the '#' symbol.
set grepResults to do shell script "grep -o " & quote & "#\\S*" & quote & " <<< " & quoted form of _text & ¬
"| sed " & quote & "s/#//g" & quote
-- the lines below are a trick to get rid of blank items resulting from, e.g., "###", etc.
set grepResultsList to paragraphs of grepResults
set AppleScript's text item delimiters to " "
set _theString to grepResultsList as string
set AppleScript's text item delimiters to ""
set grepResultsList to words of _theString
set _tagNames to _record's assigned tag names
set _record's assigned tag names to _tagNames & grepResultsList
end repeat
end tell