diff --git a/parser.go b/parser.go
index 5065b31..d042de9 100644
--- a/parser.go
+++ b/parser.go
@@ -23,17 +23,23 @@ type Parser struct {
 
 // NewParser to create a new Parser instance
 func NewParser(includeRegex string, excludeRegex string) (*Parser, error) {
+	var err error
+	var includeRegexCompiled, excludeRegexCompiled *regexp.Regexp
 
 	log.Debugf("compiling include name regex")
-	includeRegexCompiled, err := regexp.Compile(includeRegex)
-	if err != nil {
-		return nil, err
+	if includeRegex != "" {
+		includeRegexCompiled, err = regexp.Compile(includeRegex)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	log.Debugf("compiling exclude name regex")
-	excludeRegexCompiled, err := regexp.Compile(excludeRegex)
-	if err != nil {
-		return nil, err
+	if excludeRegex != "" {
+		excludeRegexCompiled, err = regexp.Compile(excludeRegex)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	log.Debugf("creating context with headless browser drivers")
@@ -105,13 +111,14 @@ func (p *Parser) filterExclusive(products []*Product) []*Product {
 	var filtered []*Product
 	if p.excludeRegex != nil {
 		for _, product := range products {
-			if !p.excludeRegex.MatchString(product.Name) {
-				log.Debugf("product %s included because it matches does not match the exclude regex", product.Name)
-				filtered = append(filtered, product)
-			} else {
+			if p.excludeRegex.MatchString(product.Name) {
 				log.Debugf("product %s excluded because it matches the exclude regex", product.Name)
+			} else {
+				log.Debugf("product %s included because it does not match the exclude regex", product.Name)
+				filtered = append(filtered, product)
 			}
 		}
+		return filtered
 	}
 	return products
 }
diff --git a/parser_test.go b/parser_test.go
new file mode 100644
index 0000000..6c9f83f
--- /dev/null
+++ b/parser_test.go
@@ -0,0 +1,86 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestFilterInclusive(t *testing.T) {
+	tests := []struct {
+		regex    string // inclusive regex
+		name     string // product name
+		included bool   // should be included or not
+	}{
+		{"(?i)(rtx|rx)(.*)(3060|3070|3080|3090|5700|6800|6900)( )?(xt|ti)?", "MSI GeForce RTX 3060 GAMING X", true},             // 3060 in the include regex
+		{"(?i)(rtx|rx)(.*)(3060|3070|3080|3090|5700|6800|6900)( )?(xt|ti)?", "ASUS AMD Radeon RX 5600 XT TUF Gaming X3", false}, // 5600 not in the include regex
+		{"", "MSI GeForce RTX 3060 GAMING X", true}, // do nothing when the include regex is empty
+	}
+
+	for i, tc := range tests {
+		t.Run(fmt.Sprintf("TestFilterInclusive#%d", i), func(t *testing.T) {
+			p, err := NewParser(tc.regex, "")
+			if err != nil {
+				t.Errorf("failed to initialize parser: %s", err)
+			} else {
+				products := []*Product{{Name: tc.name}}
+				filtered := p.filterInclusive(products)
+				included := false
+				for _, product := range filtered {
+					if product.Name == tc.name && !included {
+						included = true
+					}
+				}
+				if tc.included != included {
+					t.Errorf("regex '%s' for product '%s': got included=%t, want included=%t", tc.regex, tc.name, included, tc.included)
+				} else {
+					if included {
+						t.Logf("regex '%s' includes product '%s'", tc.regex, tc.name)
+					} else {
+						t.Logf("regex '%s' excludes product '%s'", tc.regex, tc.name)
+					}
+
+				}
+			}
+		})
+	}
+}
+
+func TestFilterExclusive(t *testing.T) {
+	tests := []struct {
+		regex    string // exclusive regex
+		name     string // product name
+		included bool   // should be included or not
+	}{
+		{"(?i)(rtx|rx)(.*)(3060|3070|3080|3090|5700|6800|6900)( )?(xt|ti)?", "MSI GeForce RTX 3060 GAMING X", false},           // 3060 in the exclude regex
+		{"(?i)(rtx|rx)(.*)(3060|3070|3080|3090|5700|6800|6900)( )?(xt|ti)?", "ASUS AMD Radeon RX 5600 XT TUF Gaming X3", true}, // 5600 not in the exclude regex
+		{"", "MSI GeForce RTX 3060 GAMING X", true}, // do nothing when the exclude regex is empty
+	}
+
+	for i, tc := range tests {
+		t.Run(fmt.Sprintf("TestFilterExclusive#%d", i), func(t *testing.T) {
+			p, err := NewParser("", tc.regex)
+			if err != nil {
+				t.Errorf("failed to initialize parser: %s", err)
+			} else {
+				products := []*Product{{Name: tc.name}}
+				filtered := p.filterExclusive(products)
+				included := false
+				for _, product := range filtered {
+					if product.Name == tc.name && !included {
+						included = true
+					}
+				}
+				if tc.included != included {
+					t.Errorf("regex '%s' for product '%s': got included=%t, want included=%t", tc.regex, tc.name, included, tc.included)
+				} else {
+					if included {
+						t.Logf("regex '%s' includes product '%s'", tc.regex, tc.name)
+					} else {
+						t.Logf("regex '%s' excludes product '%s'", tc.regex, tc.name)
+					}
+
+				}
+			}
+		})
+	}
+}