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-rw-r--r--pygments/lexers/agile.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/agile.py b/pygments/lexers/agile.py
index 707bad33..ee0cd368 100644
--- a/pygments/lexers/agile.py
+++ b/pygments/lexers/agile.py
@@ -392,7 +392,7 @@ class RubyLexer(ExtendedRegexLexer):
r'warn)\b', Name.Builtin),
(r'__(FILE|LINE)__\b', Name.Builtin.Pseudo),
# normal heredocs
- (r'(<<-?)(["`\']?)([a-zA-Z_]\w*)(\2)(.*?\n)', heredoc_callback),
+ (r'(?<!\w)(<<-?)(["`\']?)([a-zA-Z_]\w*)(\2)(.*?\n)', heredoc_callback),
# empty string heredocs
(r'(<<-?)("|\')()(\2)(.*?\n)', heredoc_callback),
(r'__END__', Comment.Preproc, 'end-part'),