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-rw-r--r--pygments/lexers/math.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/math.py b/pygments/lexers/math.py
index 7b738e38..9139e19a 100644
--- a/pygments/lexers/math.py
+++ b/pygments/lexers/math.py
@@ -1012,7 +1012,7 @@ class SLexer(RegexLexer):
'valid_name': [
(r'[a-zA-Z][0-9a-zA-Z\._]+', Text),
# can begin with ., but not if that is followed by a digit
- (r'\.[a-zA-Z._][0-9a-zA-Z\._]+', Text),
+ (r'\.[a-zA-Z_][0-9a-zA-Z\._]+', Text),
(r'`.+`', String.Backtick),
],
'punctuation': [