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.

Serpent ‘Ser’

English

References: TB Latin ?: ?. – TB Robbins: 55
Translation of:
Greek: Ὄφις [TB Robbins: 1:9, 26]
Arabic: الحيّة [TB Ar. Yamamoto: 1:9, 48:9]