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.

Job vacancy: One or two new Hilfskräfte with good knowledge of Arabic

The project Ptolemaeus Arabus et Latinus is searching for one or two Hilfskräfte with a good account of written Arabic, starting from 1 October 2017 or as soon as possible thereafter. The full text of the job description can be found at http://ptolemaeus.badw.de/jobs