diff --git a/README.md b/README.md
index fd482ee..88714d1 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Download both files as csvs to the same folder as the script. Then, using the co
 ./ecompare -data=emails -A=fileA.csv -B=fileB.csv
 ```
 
-* `-data` specifies the type of data to compare. It can be `emails`, `sha256` or `dni` (Spanish ID numbers)
+* `-data` specifies the type of data to compare. It can be `emails`, `sha256`, `urls` or `dni` (Spanish ID numbers)
 * `-A` and `-B` specify the names of both files.
 
 #### Get details about the comparison
diff --git a/doc.go b/doc.go
index c056c95..66040e2 100644
--- a/doc.go
+++ b/doc.go
@@ -30,7 +30,7 @@ Download both files as csvs to the same folder as the script. Then, using the co
 
     ./ecompare -data=emails -A=fileA.csv -B=fileB.csv
 
-    -data specifies the type of data to compare. It can be emails, sha256 or dni (Spanish ID numbers)
+    -data specifies the type of data to compare. It can be emails, sha256, urls or dni (Spanish ID numbers)
 
     -A and -B specify the names of both files.
 
diff --git a/ecompare.go b/ecompare.go
index 920478c..4ec28c7 100644
--- a/ecompare.go
+++ b/ecompare.go
@@ -13,6 +13,8 @@ const shaRegex string = `[A-Fa-f0-9]{64}`
 
 const dninieRegex string = `[A-z]?\d{7,8}[TRWAGMYFPDXBNJZSQVHLCKEtrwagmyfpdxbnjzsqvhlcke]`
 
+const urlsRegex string = `https?://([\da-z\.-]+)\.([a-z\.]{2,6})([/\w \.-]*)*/?`
+
 var debug *bool
 
 func main() {
@@ -49,6 +51,9 @@ func main() {
 		case "dni":
 			aMap = searchInStringToMap(aFile, dninieRegex)
 			bMap = searchInStringToMap(bFile, dninieRegex)
+		case "urls":
+			aMap = searchInStringToMapCS(aFile, urlsRegex)
+			bMap = searchInStringToMapCS(bFile, urlsRegex)
 		default:
 			aMap = searchInStringToMap(aFile, emailRegex)
 			bMap = searchInStringToMap(bFile, emailRegex)
diff --git a/functions.go b/functions.go
index 6898de8..bf512bd 100644
--- a/functions.go
+++ b/functions.go
@@ -42,6 +42,21 @@ func searchInStringToMap(total string, expression string) map[string]bool {
 	return a
 }
 
+// searchInStringToMapCS Reads a string and returns all matches (case sensitive) in the regular expression as map keys
+func searchInStringToMapCS(total string, expression string) map[string]bool {
+	defer timeTrack(time.Now(), "searchInStringToMapCS")
+	r, err := regexp.Compile(expression)
+	if err != nil {
+		panic(err)
+	}
+	allMatches := r.FindAllString(total, -1)
+	a := make(map[string]bool)
+	for _, v := range allMatches {
+		a[v] = false
+	}
+	return a
+}
+
 // Compare Compares 2 maps with words as what to search and boleans false value. Transforms in true when the key exists in the other map.
 func Compare(a map[string]bool, b map[string]bool) (map[string]bool, map[string]bool) {
 	defer timeTrack(time.Now(), "Compare")
diff --git a/help.go b/help.go
index b029fc9..d855429 100644
--- a/help.go
+++ b/help.go
@@ -10,7 +10,7 @@ func helpMe() {
 
 Script to compare unique data from two text files, named A and B
 
-- unique data includes emails or sha256
+- unique data includes emails, sha256, urls or dni
 - text files include csv, txt, sql or html
 
 Use the options as in this example:
@@ -30,7 +30,7 @@ Each time the script runs it overwrites this 3 files.
 Comand line options:
 
 -help				Display this help
--data=emails			What to compare in the files. It can be "emails", "sha256" or "dni". By default it compares emails.
+-data=emails			What to compare in the files. It can be "emails", "sha256", "urls" or "dni". By default it compares emails.
 -A=fileA.csv			File A name
 -B=fileB.csv			File B name
 -debug=true			Debug the script