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.

صحَّحَ  ‘correction’

Arabic

References: PH Morelon: I.2:1, 17:10
Translation of:
Greek: διόρθωσις [PH Heiberg: I.2:1, 72:10]
Modern translations:
French: vérifier [PH Morelon: I.2:1, 16:17]
German: berichtigen [PH Nix: I.2:1, 73:13]