Adjust expected errors for PHP 8

Author: mrliptontea

test/unit/ExtendedGraphTest.php

@@ -68,7 +68,7 @@ public function addInvalidValueToLiteralResultsInNoTriple_Provider(): iterable
      */
     public function testAddInvalidSubjectToLiteralThrowsException($value): void
     {
-        $this->expectExceptionMessageMatches('/^(The subject is invalid|Argument 1.+must be of the type string.+)$/');
+        $this->expectExceptionMessageMatches('/^The subject is invalid$|Argument #?1.+must be of (the )?type string.+/');
 
         $graph = new ExtendedGraph();
         $graph->add_resource_triple($value, 'http://some/predicate', 'http://someplace.com');
@@ -93,7 +93,7 @@ public function addInvalidSubjectToLiteralResultsInNoTriple_Provider(): iterable
      */
     public function testAddInvalidPredicateToLiteralThrowsException($value): void
     {
-        $this->expectExceptionMessageMatches('/^(The predicate is invalid|Argument 2.+must be of the type string.+)$/');
+        $this->expectExceptionMessageMatches('/^The predicate is invalid$|Argument #?2.+must be of (the )?type string.+/');
 
         $graph = new ExtendedGraph();
         $graph->add_resource_triple('http://some/subject/1', $value, 'http://someplace.com');
@@ -163,7 +163,7 @@ public function addInvalidValueToResourceResultsInNoTriple_Provider(): iterable
      */
     public function testAddInvalidSubjectToResourceThrowsException($value): void
     {
-        $this->expectExceptionMessageMatches('/^(The subject is invalid|Argument 1.+must be of the type string.+)$/');
+        $this->expectExceptionMessageMatches('/^The subject is invalid$|Argument #?1.+must be of (the )?type string.+/');
 
         $graph = new ExtendedGraph();
         $graph->add_resource_triple($value, 'http://some/predicate', 'http://someplace.com');
@@ -188,7 +188,7 @@ public function addInvalidSubjectToResourceResultsInNoTriple_Provider(): iterabl
      */
     public function testAddInvalidPredicateToResourceThrowsException($value): void
     {
-        $this->expectExceptionMessageMatches('/^(The predicate is invalid|Argument 2.+must be of the type string.+)$/');
+        $this->expectExceptionMessageMatches('/^The predicate is invalid$|Argument #?2.+must be of (the )?type string.+/');
 
         $graph = new ExtendedGraph();
         $graph->add_resource_triple('http://some/subject/1', $value, 'http://someplace.com');