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.

star ‘star’

English

References: Alm. Toomer: 37. – PH Hamm: I.7:1, 49:8
Translation of:
Greek: ἀστήρ [Alm. Heiberg: VII-VIII; I.2, 9:6; I.3, 11:14. – PH Heiberg: I.7:1, 78:16]