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.

موجود بالفعل ‘substratum’

Arabic

References: Alm. MS Tunis: I.1:8, f. 1v:27
Translation of:
Greek: ὑποκείμενον [Alm. Heiberg: I.1, 5:12]
Synonyms:
قائم بنفسه[Alm. MS Leiden: I.1:8, f. 2v:26]