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.

Naṣīr al-Dīn al-Ṭūsī, Taḥrīr al-Majisṭī

Istanbul, Nuruosmaniye, 2941 · 67v

Facsimile
With special permission of the Directorate of the Turkish Institute of Manuscripts (Türkiye Yazma Eserler Kurumu Başkanlığı); all rights reserved.