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-rw-r--r--markdown/extensions/fenced_code.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/markdown/extensions/fenced_code.py b/markdown/extensions/fenced_code.py
index 8c9935e..277bac4 100644
--- a/markdown/extensions/fenced_code.py
+++ b/markdown/extensions/fenced_code.py
@@ -37,7 +37,7 @@ class FencedCodeExtension(Extension):
class FencedBlockPreprocessor(Preprocessor):
FENCED_BLOCK_RE = re.compile(r'''
(?P<fence>^(?:~{3,}|`{3,}))[ ]* # Opening ``` or ~~~
-(\{?\.?(?P<lang>[a-zA-Z0-9_+-]*))?[ ]* # Optional {, and lang
+(\{?\.?(?P<lang>[\w#.+-]*))?[ ]* # Optional {, and lang
# Optional highlight lines, single- or double-quote-delimited
(hl_lines=(?P<quot>"|')(?P<hl_lines>.*?)(?P=quot))?[ ]*
}?[ ]*\n # Optional closing }