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.

سرطان ‘Cancer’

Arabic

References: Alm. MS Leiden: f. 21r.8; f. 23r-24r. – Alm. MS Tunis: ; 27b.22; 30
Translation of:
Greek: Καρκίνος [Alm. Heiberg: II.7, 124:10; II.8, 134-140; VII.94-97]