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 · 9v

Facsimile

Quod si hec voluerint perscrutari videbuntur utique qui utilitatem huius facultatis reprehendunt ad nullum eorum, que precipuas sunt, respicere; sed ad hoc ipsum solum quod eorum precognitio que omnino ac penitus eventura sunt supervacanea sit, valde autem simpliciter hoc faciunt et non bene.