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.

مجرى ‘traversing’

Arabic

References: Alm. MS Leiden: f. 17r
Translation of:
Greek: διαπορευόμενος [Alm. Heiberg: II.6, 102:14; II.6, 104:17]
Synonyms:
إذا كان يصير[Alm. MS Tunis: 22b.8,9; 23a.6]
ممرّ[Alm. MS Leiden: f. 17v.6,7]