diff --git a/src/lib.rs b/src/lib.rs
index 31a25ad..9900876 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,23 +5,23 @@ pub mod wikipedia_infobox_analyzer {
     use itertools::Itertools;
 
     /// Looks for a used template that does lists wikidata properties listing
-    pub fn extract_used_properties_from_template(template: String) -> Vec<String> {
+    pub fn extract_used_properties_from_template(template: String) -> Vec<u64> {
         let mut lines = template.lines();
         let used = lines
             .find(|line| line.starts_with("{{") && line.contains("Wikidata|"))
             .expect("Template should have a line declaring which properties are used");
 
         // The properties are listed inside the template with their number: P1|P2|P...
-        let re = Regex::new(r"P\d+").unwrap();
+        let re = Regex::new(r"P(\d+)").unwrap();
 
         // Find all matches and collect the properties into vector
-        re.find_iter(used)
-          .map(|m| m.as_str().to_owned())
+        re.captures_iter(used)
+          .map(|m| m[1].parse().unwrap())
           .collect()
     }
 
     /// Creates an ascii infobox out of the properties
-    pub fn format_infobox_from_used_properties(name: String, properties: Vec<String>) -> String {
+    pub fn format_infobox_from_used_properties(name: String, properties: Vec<u64>) -> String {
         let mut ascii_table = AsciiTable::default();
         ascii_table.set_max_width(26);
         ascii_table
@@ -29,7 +29,7 @@ pub mod wikipedia_infobox_analyzer {
             .set_header(name)
             .set_align(Align::Left);
 
-        let data: Vec<Vec<&String>> = properties.iter().map(|v| vec![v]).collect();
+        let data: Vec<Vec<String>> = properties.iter().map(|v| vec![format!("P{v}")]).collect();
         ascii_table.format(data)
     }
 
@@ -116,9 +116,9 @@ mod tests {
         assert_eq!(
             extract_used_properties_from_template(contents),
             vec![
-                "P18", "P154", "P1128", "P4103", "P2139", "P2295", "P2226", "P856", "P169",
-                "P1448", "P159", "P749", "P355", "P17", "P1056", "P452", "P576", "P112", "P127",
-                "P856", "P2096"
+                18, 154, 1128, 4103, 2139, 2295, 2226, 856, 169,
+                1448, 159, 749, 355, 17, 1056, 452, 576, 112, 127,
+                856, 2096
             ]
         );
 
@@ -128,8 +128,8 @@ mod tests {
         assert_eq!(
             extract_used_properties_from_template(contents),
             vec![
-                "P18", "P154", "P170", "P178", "P275", "P277", "P306", "P348", "P400", "P548",
-                "P571", "P577", "P856", "P1324", "P2096"
+                18, 154, 170, 178, 275, 277, 306, 348, 400, 548,
+                571, 577, 856, 1324, 2096
             ]
         );
     }
@@ -139,7 +139,7 @@ mod tests {
         assert_eq!(
             format_infobox_from_used_properties(
                 "Earth".to_string(),
-                vec!["P31".to_string(), "P361".to_string(), "P571".to_string()]
+                vec![31, 361, 571]
             ),
             concat![
                 "┌───────┐\n",