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.

Tag und Nacht/Tag mit seiner Nacht ‘day and night’

German

References: PH Nix: I.4:3, 77:10
Translation of:
Arabic: اليوم بليلته/ يوم وليلة [PH Morelon: I.4:3, 21:5]