Changed \Z to \z to fit with Go's naming

regex/compile.go

@@ -880,7 +880,7 @@ func thompson(re []postfixNode) (Reg, error) {
 						stateToAdd.assert = nonwboundAssert
 					case 'A':
 						stateToAdd.assert = soiAssert
-					case 'Z':
+					case 'z':
 						stateToAdd.assert = eoiAssert
 					}
 				} else { // Lookaround

regex/postfixNode.go

@@ -98,7 +98,7 @@ func newEscapedNode(c rune, inCharClass bool) (postfixNode, error) {
 		if c == 'B' && inCharClass { // Invalid
 			return postfixNode{}, fmt.Errorf("word boundaries are not allowed in character class")
 		}
-	case 'A', 'Z': // A is start of input, Z is end of input (regardless of RE_MULTILINE)
+	case 'A', 'z': // A is start of input, z is end of input (regardless of RE_MULTILINE)
 		if inCharClass {
 			return postfixNode{}, fmt.Errorf("input boundaries are not allowed in character class")
 		} else {

regex/re_test.go

@@ -446,8 +446,8 @@ var reTests = []struct {
 	{`\A`, []ReFlag{RE_MULTILINE}, "jkl\n123abc\nxyz", []Group{{0, 0}}},
 	{`$`, nil, "jkl\n123abc\nxyz", []Group{{14, 14}}},
 	{`$`, []ReFlag{RE_MULTILINE}, "jkl\n123abc\nxyz", []Group{{3, 3}, {10, 10}, {14, 14}}},
-	{`\Z`, []ReFlag{RE_MULTILINE}, "jkl\n123abc\nxyz", []Group{{14, 14}}},
-	{`^abc\Z`, []ReFlag{RE_MULTILINE}, "abc\nabc\nabc", []Group{{8, 11}}},
+	{`\z`, []ReFlag{RE_MULTILINE}, "jkl\n123abc\nxyz", []Group{{14, 14}}},
+	{`^abc\z`, []ReFlag{RE_MULTILINE}, "abc\nabc\nabc", []Group{{8, 11}}},
 
 	{`a.b`, nil, "a\nb", []Group{}},
 	{`a.b`, []ReFlag{RE_SINGLE_LINE}, "a\nb", []Group{{0, 3}}},