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.

trennen ‘free’

German

References: PH Nix: I.2:4, 73:34
Translation of:
Arabic: باين (مباين) [PH Morelon: I.2:4, 17:17]
Synonyms:
frei[Plan. Hyp.: II.8, 120]
lose[PH Nix: II.8, 120]