RDF.Literal.matches-question-mark

You're seeing just the function matches-question-mark, go back to RDF.Literal module for more information.
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matches?(value, pattern, flags \\ "")

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Specs

matches?(
  t() | String.t(),
  pattern :: t() | String.t(),
  flags :: t() | String.t()
) :: boolean()

Matches the lexical form of the given RDF.Literal against a XPath and XQuery regular expression pattern with flags.

The regular expression language is defined in XQuery 1.0 and XPath 2.0 Functions and Operators.

see https://www.w3.org/TR/xpath-functions/#func-matches