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.

Isaac Argyros, 〈Paraphrasis in Anonymum commentum in Quadripartitum〉

Madrid, UC-BH, cod. 122 · 60r

Facsimile

in orientali horizonte ceciderit initum quidem eventus accidentis in primo ab eclipsis tempore quadrimestri significat et universales circunstantias in prima tertia parte temporis totius productionis. Cum vero in medium celi inciderit in secundo quadrimestri et media tertia parte. Cum autem in occidentalem horizontem inciderit in tertio quadrimestri et ultima tertia parte.