diff --git a/django/contrib/gis/gdal/tests/test_geom.py b/django/contrib/gis/gdal/tests/test_geom.py
index c547135b170..65d78a17354 100644
--- a/django/contrib/gis/gdal/tests/test_geom.py
+++ b/django/contrib/gis/gdal/tests/test_geom.py
@@ -121,6 +121,9 @@ class OGRGeomTest(unittest.TestCase, TestDataMixin):
                 self.assertEqual(json.loads(g.json), json.loads(geom.json))
                 self.assertEqual(json.loads(g.json), json.loads(geom.geojson))
             self.assertEqual(OGRGeometry(g.wkt), OGRGeometry(geom.json))
+        # Test input with some garbage content (but valid json) (#15529)
+        geom = OGRGeometry('{"type": "Point", "coordinates": [ 100.0, 0.0 ], "other": "<test>"}')
+        self.assertIsInstance(geom, OGRGeometry)
 
     def test02_points(self):
         "Testing Point objects."
diff --git a/django/contrib/gis/geometry/regex.py b/django/contrib/gis/geometry/regex.py
index 22d16cb4c88..7dbcbfa4e7e 100644
--- a/django/contrib/gis/geometry/regex.py
+++ b/django/contrib/gis/geometry/regex.py
@@ -9,4 +9,4 @@ wkt_regex = re.compile(r'^(SRID=(?P<srid>\-?\d+);)?'
                        r'(?P<type>POINT|LINESTRING|LINEARRING|POLYGON|MULTIPOINT|MULTILINESTRING|MULTIPOLYGON|GEOMETRYCOLLECTION)'
                        r'[ACEGIMLONPSRUTYZ\d,\.\-\(\) ]+)$',
                        re.I)
-json_regex = re.compile(r'^(\s+)?\{[\s\w,\[\]\{\}\-\."\':]+\}(\s+)?$')
+json_regex = re.compile(r'^(\s+)?\{.*}(\s+)?$', re.DOTALL)