PAL

Ptolemaeus Arabus et Latinus

_ (the underscore) is the placeholder for exactly one character.
% (the percent sign) is the placeholder for no, one or more than one character.
%% (two percent signs) is the placeholder for no, one or more than one character, but not for blank space (so that a search ends at word boundaries).

At the beginning and at the end, these placeholders are superfluous.

اقتصاص‘exposition’

Arabic. – Grammar: n..

References: PH Heiberg: I.1:1, 15:2
Modern translations:
French: exposition [PH Nix: I.1:1, 14:5]
German: Darlegung [PH Nix: I.1:1, 71:2]