diff --git a/youtube_dl/extractor/rai.py b/youtube_dl/extractor/rai.py
index 7b0315a62..563d3400f 100644
--- a/youtube_dl/extractor/rai.py
+++ b/youtube_dl/extractor/rai.py
@@ -106,7 +106,7 @@ class RaiBaseIE(InfoExtractor):
         }.items() if v is not None)
 
     def _create_http_urls(self, relinker_url, fmts):
-        _RELINKER_REG = r'https?://(?P<host>[^/]+?)/(?:i/)?(?P<extra>[^/]+?)/(?P<path>.+?)/(?P<id>\d+)(?:_(?P<quality>[\d\,]+))?(?:\.mp4|/playlist\.m3u8).+?'
+        _RELINKER_REG = r'https?://(?P<host>[^/]+?)/(?:i/)?(?P<extra>[^/]+?)/(?P<path>.+?)/(?P<id>\w+)(?:_(?P<quality>[\d\,]+))?(?:\.mp4|/playlist\.m3u8).+?'
         _MP4_TMPL = '%s&overrideUserAgentRule=mp4-%s'
         _QUALITY = {
             # tbr: w, h