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.

Ptolemy, De planetarum hypothesibus liber (tr. John Bainbridge)

London, Guilielmus Jones, 1620 · 8

Facsimile

Nycthemeron autem est tempus, quo Sol mundi conversione unam ad immobilem aequinoctialem conficit periodum. Et manifestum est si Sol per zodiacum non moveretur, idem fore nycthemeron cum mundi conversione; at cum in ortum moveri supponatur, diuturnius est nycthemeron quam mundi con