Problem: grep golfing technique

Code: grep+golfing+technique/tails_1657605175

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

% (split (remove empties)):[[chr]] 
    + (concat):[chr] 
        % (split (remove empties)):[[chr]] 
            @ (= fstLine):[chr] 
            "-e " (string):[chr] 
    "\" \"" (string):[chr]