Add endanchored tests for DFA matching.

testdata/testinput6

@@ -4892,4 +4892,23 @@
 /^(a(?2))(b)(?1)/
     abbab\=find_limits 
 
+/abc/endanchored
+    xyzabc
+\= Expect no match
+    xyzabcdef
+\= Expect error
+    xyzabc\=ph
+
+/abc/
+    xyzabc\=endanchored
+\= Expect no match
+    xyzabcdef\=endanchored
+\= Expect error
+    xyzabc\=ps,endanchored
+
+/abc|bcd/endanchored
+    xyzabcd
+\= Expect no match
+    xyzabcdef
+
 # End of testinput6

testdata/testoutput6

@@ -7694,4 +7694,31 @@ Failed: error -53: matching depth limit exceeded
 Minimum depth limit = 2
  0: abbab
 
+/abc/endanchored
+    xyzabc
+ 0: abc
+\= Expect no match
+    xyzabcdef
+No match
+\= Expect error
+    xyzabc\=ph
+Failed: error -34: bad option value
+
+/abc/
+    xyzabc\=endanchored
+ 0: abc
+\= Expect no match
+    xyzabcdef\=endanchored
+No match
+\= Expect error
+    xyzabc\=ps,endanchored
+Failed: error -34: bad option value
+
+/abc|bcd/endanchored
+    xyzabcd
+ 0: bcd
+\= Expect no match
+    xyzabcdef
+No match
+
 # End of testinput6