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-rw-r--r--pygments/lexers/shell.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/shell.py b/pygments/lexers/shell.py
index 7c2c3743..ceb6f14d 100644
--- a/pygments/lexers/shell.py
+++ b/pygments/lexers/shell.py
@@ -51,7 +51,7 @@ class BashLexer(RegexLexer):
(r'\$\(\(', Keyword, 'math'),
(r'\$\(', Keyword, 'paren'),
(r'\$\{#?', String.Interpol, 'curly'),
- (r'\$[a-zA-Z_][a-zA-Z0-9_]*', Name.Variable), # user variable
+ (r'\$[a-zA-Z_]\w*', Name.Variable), # user variable
(r'\$(?:\d+|[#$?!_*@-])', Name.Variable), # builtin
(r'\$', Text),
],