diff --git a/lizmap_server/get_legend_graphic.py b/lizmap_server/get_legend_graphic.py
index e337be91..d011dd31 100644
--- a/lizmap_server/get_legend_graphic.py
+++ b/lizmap_server/get_legend_graphic.py
@@ -7,6 +7,7 @@
 
 import json
 import re
+from typing import Optional
 
 from qgis.core import Qgis, QgsDataSourceUri, QgsProject
 from qgis.server import QgsServerFilter
@@ -21,6 +22,13 @@ class GetLegendGraphicFilter(QgsServerFilter):
     only works for single LAYER and STYLE(S) and json format.
     """
 
+    FEATURE_COUNT_REGEXP = r"(.*) \[≈?(?:\d+|N/A)\]"
+
+    @classmethod
+    def match_label_feature_count(cls, symbol_label: str) -> Optional[re.Match]:
+        """Regexp for extracting the feature count from the label. """
+        return re.match(cls.FEATURE_COUNT_REGEXP, symbol_label)
+
     @exception_handler
     def responseComplete(self):
 
@@ -129,11 +137,13 @@ def responseComplete(self):
                     symbol = symbols[idx]
                     symbol_label = symbol['title']
                     if show_feature_count:
-                        match_label = re.match(r"(.*) \[≈?(?:\d+|N/A)\]", symbol_label)
+                        match_label = self.match_label_feature_count(symbol_label)
                         if match_label:
                             symbol_label = match_label.group(1)
                         else:
-                            logger.info("GetLegendGraphic JSON: symbol label does not match '(.*) \\[≈?(?:\\d+|N/A)\\]' '{}'".format(symbol['title']))
+                            logger.info(
+                                "GetLegendGraphic JSON: symbol label does not match '{}' '{}'".format(
+                                    self.FEATURE_COUNT_REGEXP, symbol['title']))
                     try:
                         category = categories[symbol_label]
                         symbol['ruleKey'] = category['ruleKey']
diff --git a/test/test_legend.py b/test/test_legend.py
index 5005f1c5..aa3d7bac 100644
--- a/test/test_legend.py
+++ b/test/test_legend.py
@@ -1,6 +1,7 @@
 import logging
 
 from test.utils import _build_query_string, _check_request
+from lizmap_server.get_legend_graphic import GetLegendGraphicFilter
 
 from qgis.core import Qgis
 
@@ -137,3 +138,15 @@ def test_simple_rule_based_feature_count(client):
     assert symbols[0]['expression'] == expected, symbols[0]['expression']
     assert b['title'] == ''
     assert b['nodes'][0]['title'] == 'rule_based [4]', b['nodes'][0]['title']
+
+
+def test_regexp_feature_count():
+    """ Test the regexp about the feature count. """
+    result = GetLegendGraphicFilter.match_label_feature_count("A label [22]")
+    assert result.group(1) == "A label", result.group(1)
+
+    result = GetLegendGraphicFilter.match_label_feature_count("A label [≈2]")
+    assert result.group(1) == "A label", result.group(1)
+
+    result = GetLegendGraphicFilter.match_label_feature_count("A label")
+    assert result is None