REGEX should use $1 instead of \1 etc.

[hannahbast]

The following query does not quite do what it should:

SELECT * WHERE {
  wd:P12047 wdt:P1630 ?formatterURL .
  ?wikidataitem wdt:P12047 ?mimotextid ;
                wdt:P50 ?author .
  BIND (IRI(REPLACE(?mimotextid, "^(.+)$", ?formatterURL)) AS ?mimotextitem) .
}

https://qlever.cs.uni-freiburg.de/wikidata/9U5biA

The issue seems to be that ?formatterURL has the value http://data.mimotext.uni-trier.de/entity/$1, but QLever wants \\1 instead of $1. It seems that the standard says it should be $1:

https://www.w3.org/TR/sparql11-query/#func-replace
https://www.w3.org/TR/xpath-functions/#func-replace