Update Regexp Field Lookup Implementation

Author: GaetanF

src/django_elasticsearch_dsl_drf/constants.py

@@ -434,7 +434,7 @@
     LOOKUP_FILTER_EXISTS,
     LOOKUP_FILTER_PREFIX,
     LOOKUP_FILTER_WILDCARD,
-    # LOOKUP_FILTER_REGEXP,
+    LOOKUP_FILTER_REGEXP,
     # LOOKUP_FILTER_FUZZY,
     # LOOKUP_FILTER_TYPE,
 
@@ -475,6 +475,7 @@
     LOOKUP_FILTER_TERMS,
     LOOKUP_FILTER_PREFIX,
     LOOKUP_FILTER_WILDCARD,
+    LOOKUP_FILTER_REGEXP,
     LOOKUP_QUERY_CONTAINS,
     LOOKUP_QUERY_IN,
     LOOKUP_QUERY_STARTSWITH,

src/django_elasticsearch_dsl_drf/filter_backends/filtering/common.py

@@ -296,18 +296,16 @@ def apply_filter_range(cls, queryset, options, value):
 
     @classmethod
     def apply_filter_regexp(cls, queryset, options, value):
-        """Apply `regexp` filter.
+        """Apply `reexp` filter.
 
          Syntax:
 
-            /endpoint/?field_name__regexp={lower}__{upper}__{boost}
-            /endpoint/?field_name__regexp={lower}__{upper}
+            /endpoint/?field_name__regexp={regexp}
 
         Example:
 
-            http://localhost:8000/api/users/?age__regexp=16__67__2.0
-            http://localhost:8000/api/users/?age__regexp=16__67
-            http://localhost:8000/api/users/?age__regexp=16
+            http://localhost:8000/api/users/?age__regexp=1[6-9]
+            http://localhost:8000/api/users/?age__regexp=2.*
 
         :param queryset: Original queryset.
         :param options: Filter options.

src/django_elasticsearch_dsl_drf/tests/test_filtering_common.py

@@ -193,6 +193,19 @@ def test_field_filter_range(self):
             self.published_count
         )
 
+    def test_field_filter_regexp(self):
+        """Field filter regexp.
+
+        Example:
+
+            http://localhost:8000/api/users/?title__regexp=De.{8}Ins.*
+        """
+        return self._field_filter_value(
+            'title__regexp',
+            '{}.{{8}}{}.*'.format(self.prefix[0:2], self.prefix[10:13]),
+            self.prefix_count
+        )
+
     def test_field_filter_range_with_boost(self):
         """Field filter range.
 
@@ -325,19 +338,6 @@ def test_field_filter_wildcard(self):
             self.prefix_count
         )
 
-    def test_field_filter_regexp(self):
-        """Test filter regexp.
-
-        Example:
-
-            http://localhost:8000/api/articles/?title__wildcard=*elusional*
-        """
-        return self._field_filter_value(
-            'title__regexp',
-            '.{2}lusional.{2}sanity\s.*',
-            self.prefix_count
-        )
-
     def test_field_filter_exclude(self):
         """Test filter exclude.