[2chan] fix metadata extraction

gallery_dl/extractor/2chan.py

@@ -68,6 +68,8 @@ class _2chanThreadExtractor(Extractor):
     def parse(self, post):
         """Build post-object by extracting data from an HTML post"""
         data = self._extract_post(post)
+        if data["name"]:
+            data["name"] = data["name"].strip()
         if '<a href="/' in post:
             self._extract_image(post, data)
             data["tim"], _, data["extension"] = data["filename"].partition(".")
@@ -78,10 +80,10 @@ class _2chanThreadExtractor(Extractor):
     @staticmethod
     def _extract_post(post):
         return text.extract_all(post, (
-            ("no"  , 'name="', '"'),
-            ("post", '<b>', '</b>'),
-            ("name", '<b>', ' </b>'),
-            ("now" , '</font> ', ' '),
+            ("post", 'class="csb">'   , '<'),
+            ("name", 'class="cnm">'   , '<'),
+            ("now" , 'class="cnw">'   , '<'),
+            ("no"  , 'class="cno">No.', '<'),
             (None  , '<blockquote', ''),
             ("com" , '>', '</blockquote>'),
         ))[0]

gallery_dl/extractor/wikiart.py

@@ -93,7 +93,7 @@ class WikiartArtworksExtractor(WikiartExtractor):
     directory_fmt = ("{category}", "Artworks by {group!c}", "{type}")
     pattern = BASE_PATTERN + r"/paintings-by-([\w-]+)/([\w-]+)"
     test = ("https://www.wikiart.org/en/paintings-by-media/grisaille", {
-        "url": "f92d55669fa949491c26a5437527adb14b35b8cc",
+        "url": "228426a9d32b5bba9d659944c6b0ba73883af33f",
     })
 
     def __init__(self, match):