Ptolemaeus Arabus et Latinus

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`_`	(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.

flexus tenebrarum ‘the direction of darkness in an eclipse’

Latin. – Grammar: noun.

References:	Alm. minor Zepeda: VI principles