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.

planet ‘planet’

English

References: Alm. Toomer: 38; 46
Translation of:
Greek: πλανήτης [Alm. Heiberg: I.2, 9:11]
Greek: πλανώμενος ἀστήρ [Alm. Heiberg: I.8, 27:15]
Synonyms:
planets[PH Hamm: I.5:1, 48:7]
planets[Alm. Toomer: 46]