How to escape brackets in sparql string?

@rollin 

To escape brackets in a SPARQL string, you can use the backslash () character before each opening and closing bracket. For example, if you want to escape a set of brackets in a SPARQL string, you can write it as follows:

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SELECT * WHERE {
  ?s rdf:type ?o .
  FILTER regex(str(?o), "(example)")
}

In this example, the backslashes are used to escape the opening and closing brackets in the regex function, allowing the query to be executed without errors.