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.

αἰθήρ‘aether’

Greek. – Grammar: n.

References: Alm. Heiberg: I.3, 14:2. – TB Robbins: 1:2, 2
Translated into:
Arabic: الإٽير [TB Ar. Yamamoto: 1:2, 10:5]
Arabic: أثير [Alm. MS Tunis: . – Plan. Hyp.: II.11]
Modern translations:
English: aether [Alm. Toomer: 40]
English: ether [TB Robbins: 7]