diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc
index 1bf2cc8f762..320cc2a72de 100644
--- a/CHANGELOG.next.asciidoc
+++ b/CHANGELOG.next.asciidoc
@@ -376,6 +376,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix retrieving resources by ID for the azure module. {pull}21711[21711] {issue}21707[21707]
 - Use timestamp from CloudWatch API when creating events. {pull}21498[21498]
 - Report the correct windows events for system/filesystem {pull}21758[21758]
+- Fix regular expression in windows/permfon. {pull}22146[22146] {issue}21125[21125]
 - Fix azure storage event format. {pull}21845[21845]
 - Fix panic in kubernetes autodiscover related to keystores {issue}21843[21843] {pull}21880[21880]
 - [Kubernetes] Remove redundant dockersock volume mount {pull}22009[22009]
diff --git a/metricbeat/helper/windows/pdh/pdh_query_windows.go b/metricbeat/helper/windows/pdh/pdh_query_windows.go
index 3c51df5073a..8cc3a46edc8 100644
--- a/metricbeat/helper/windows/pdh/pdh_query_windows.go
+++ b/metricbeat/helper/windows/pdh/pdh_query_windows.go
@@ -30,7 +30,7 @@ import (
 )
 
 var (
-	instanceNameRegexp = regexp.MustCompile(`.*?\((.*?)\).*`)
+	instanceNameRegexp = regexp.MustCompile(`(\(.+\))\\`)
 	objectNameRegexp   = regexp.MustCompile(`(?:^\\\\[^\\]+\\|^\\)([^\\]+)`)
 )
 
@@ -86,7 +86,7 @@ func (q *Query) AddCounter(counterPath string, instance string, format string, w
 	var instanceName string
 	// Extract the instance name from the counterPath.
 	if instance == "" || wildcard {
-		instanceName, err = MatchInstanceName(counterPath)
+		instanceName, err = matchInstanceName(counterPath)
 		if err != nil {
 			return err
 		}
@@ -233,18 +233,50 @@ func (q *Query) Close() error {
 	return PdhCloseQuery(q.Handle)
 }
 
-// MatchInstanceName will check first for instance and then for any objects names.
-func MatchInstanceName(counterPath string) (string, error) {
+// matchInstanceName will check first for instance and then for any objects names.
+func matchInstanceName(counterPath string) (string, error) {
 	matches := instanceNameRegexp.FindStringSubmatch(counterPath)
-	if len(matches) != 2 {
-		matches = objectNameRegexp.FindStringSubmatch(counterPath)
+	if len(matches) == 2 {
+		return returnLastInstance(matches[1]), nil
 	}
+	matches = objectNameRegexp.FindStringSubmatch(counterPath)
 	if len(matches) == 2 {
 		return matches[1], nil
 	}
 	return "", errors.New("query doesn't contain an instance name. In this case you have to define 'instance_name'")
 }
 
+// returnLastInstance will return the content from the last parentheses, this covers cases as `\WF (System.Workflow) 4.0.0.0(*)\Workflows Created`.
+func returnLastInstance(match string) string {
+	var openedParanth int
+	var innerMatch string
+	var matches []string
+	runeMatch := []rune(match)
+	for i := 0; i < len(runeMatch); i++ {
+		char := string(runeMatch[i])
+
+		// check if string ends between parentheses
+		if char == ")" {
+			openedParanth -= 1
+		}
+		if openedParanth > 0 {
+			innerMatch += char
+		}
+		if openedParanth == 0 && innerMatch != "" {
+			matches = append(matches, innerMatch)
+			innerMatch = ""
+		}
+		// check if string starts between parentheses
+		if char == "(" {
+			openedParanth += 1
+		}
+	}
+	if len(matches) > 0 {
+		return matches[len(matches)-1]
+	}
+	return match
+}
+
 // getCounterValue will retrieve the counter value based on the format applied in the config options
 func getCounterValue(counter *Counter) CounterValue {
 	counterValue := CounterValue{Instance: counter.instanceName, Err: CounterValueError{CStatus: 0}}
diff --git a/metricbeat/helper/windows/pdh/pdh_query_windows_test.go b/metricbeat/helper/windows/pdh/pdh_query_windows_test.go
index 20d894d3924..3a09d6d77b5 100644
--- a/metricbeat/helper/windows/pdh/pdh_query_windows_test.go
+++ b/metricbeat/helper/windows/pdh/pdh_query_windows_test.go
@@ -89,6 +89,48 @@ func TestSuccessfulQuery(t *testing.T) {
 	assert.NotNil(t, list)
 }
 
+func TestMatchInstanceName(t *testing.T) {
+	query := "\\SQLServer:Databases(*)\\Log File(s) Used Size (KB)"
+	match, err := matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "*")
+
+	query = " \\\\desktop-rfooe09\\per processor network interface card activity(3, microsoft wi-fi directvirtual (gyfyg) adapter #2)\\dpcs queued/sec"
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "3, microsoft wi-fi directvirtual (gyfyg) adapter #2")
+
+	query = " \\\\desktop-rfooe09\\ (test this scenario) per processor network interface card activity(3, microsoft wi-fi directvirtual (gyfyg) adapter #2)\\dpcs queued/sec"
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "3, microsoft wi-fi directvirtual (gyfyg) adapter #2")
+
+	query = "\\RAS\\Bytes Received By Disconnected Clients"
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "RAS")
+
+	query = `\\Process (chrome.exe#4)\\Bytes Received By Disconnected Clients`
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "chrome.exe#4")
+
+	query = "\\BranchCache\\Local Cache: Cache complete file segments"
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "BranchCache")
+
+	query = `\Synchronization(*)\Exec. Resource no-Waits AcqShrdStarveExcl/sec`
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "*")
+
+	query = `\.NET CLR Exceptions(test hellp (dsdsd) #rfsfs #3)\# of Finallys / sec`
+	match, err = matchInstanceName(query)
+	assert.NoError(t, err)
+	assert.Equal(t, match, "test hellp (dsdsd) #rfsfs #3")
+}
+
 // TestInstanceNameRegexp tests regular expression for instance.
 func TestInstanceNameRegexp(t *testing.T) {
 	queryPaths := []string{`\SQLServer:Databases(*)\Log File(s) Used Size (KB)`, `\Search Indexer(*)\L0 Indexes (Wordlists)`,
@@ -96,7 +138,7 @@ func TestInstanceNameRegexp(t *testing.T) {
 	for _, path := range queryPaths {
 		matches := instanceNameRegexp.FindStringSubmatch(path)
 		if assert.Len(t, matches, 2, "regular expression did not return any matches") {
-			assert.Equal(t, matches[1], "*")
+			assert.Equal(t, matches[1], "(*)")
 		}
 	}
 }
@@ -114,6 +156,28 @@ func TestObjectNameRegexp(t *testing.T) {
 	}
 }
 
+func TestReturnLastInstance(t *testing.T) {
+	query := "(*)"
+	match := returnLastInstance(query)
+	assert.Equal(t, match, "*")
+
+	query = "(3, microsoft wi-fi directvirtual (gyfyg) adapter #2)"
+	match = returnLastInstance(query)
+	assert.Equal(t, match, "3, microsoft wi-fi directvirtual (gyfyg) adapter #2")
+
+	query = "(test this scenario) per processor network interface card activity(3, microsoft wi-fi directvirtual (gyfyg) adapter #2)"
+	match = returnLastInstance(query)
+	assert.Equal(t, match, "3, microsoft wi-fi directvirtual (gyfyg) adapter #2")
+
+	query = `(chrome.exe#4)`
+	match = returnLastInstance(query)
+	assert.Equal(t, match, "chrome.exe#4")
+
+	query = `(test hellp (dsdsd) #rfsfs #3)`
+	match = returnLastInstance(query)
+	assert.Equal(t, match, "test hellp (dsdsd) #rfsfs #3")
+}
+
 func TestUTF16ToStringArray(t *testing.T) {
 	var array = []string{"\\\\DESKTOP-RFOOE09\\Physikalischer Datenträger(0 C:)\\Schreibvorgänge/s", "\\\\DESKTOP-RFOOE09\\Physikalischer Datenträger(_Total)\\Schreibvorgänge/s", ""}
 	var unicode []uint16
diff --git a/metricbeat/module/windows/perfmon/data.go b/metricbeat/module/windows/perfmon/data.go
index 833c5757220..6e4e9c6ef0a 100644
--- a/metricbeat/module/windows/perfmon/data.go
+++ b/metricbeat/module/windows/perfmon/data.go
@@ -33,7 +33,7 @@ import (
 	"github.com/elastic/beats/v7/metricbeat/mb"
 )
 
-var processRegexp = regexp.MustCompile(`(.+?)#[1-9]+`)
+var processRegexp = regexp.MustCompile(`(.+?[^\s])(?:#\d+|$)`)
 
 func (re *Reader) groupToEvents(counters map[string][]pdh.CounterValue) []mb.Event {
 	eventMap := make(map[string]*mb.Event)
@@ -73,7 +73,7 @@ func (re *Reader) groupToEvents(counters map[string][]pdh.CounterValue) []mb.Eve
 						Error:           errors.Wrapf(val.Err.Error, "failed on query=%v", counterPath),
 					}
 					if val.Instance != "" {
-						//will ignore instance counter
+						//will ignore instance index
 						if ok, match := matchesParentProcess(val.Instance); ok {
 							eventMap[eventKey].MetricSetFields.Put(counter.InstanceField, match)
 						} else {
diff --git a/metricbeat/module/windows/perfmon/data_test.go b/metricbeat/module/windows/perfmon/data_test.go
index df23d1667ff..7203963d2cc 100644
--- a/metricbeat/module/windows/perfmon/data_test.go
+++ b/metricbeat/module/windows/perfmon/data_test.go
@@ -159,9 +159,13 @@ func TestGroupToSingleEvent(t *testing.T) {
 
 func TestMatchesParentProcess(t *testing.T) {
 	ok, val := matchesParentProcess("svchost")
-	assert.False(t, ok)
+	assert.True(t, ok)
 	assert.Equal(t, val, "svchost")
 	ok, val = matchesParentProcess("svchost#54")
 	assert.True(t, ok)
 	assert.Equal(t, val, "svchost")
+
+	ok, val = matchesParentProcess("svchost (test) another #54")
+	assert.True(t, ok)
+	assert.Equal(t, val, "svchost (test) another #54")
 }