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.

Pseudo-Ptolemy, Liber proiectionis radiorum stellarum

Vatican, BAV, Reg. lat. 1285 · 138v

Facsimile

arcum noctis gradus ipsius planete multiplicabis, et quod collectum fuerit per equatam radiationem divides et quod exierit erit equatio radiationis. Si autem ipse planeta fuerit inter gradum septimi et gradum anguli terre, minues equationem radiationis de loco radiationis secunde. Et si inter gradum anguli terre minues… terre] section omitted by the scribe, who added below the text V et gradum ascendentis fuerit, eum prime superaddes et quod collectum fuerit erit locus radiationis equate.