fix lua regex causing runaway backtracking.

thavelick · thavelick · commit b6a51ece09e3 · 2025-05-05T17:44:43.000-06:00
Use negative lookahead to avoid runway backtracking in whitespace. Fixes #2839
diff --git a/pygments/lexers/scripting.py b/pygments/lexers/scripting.py
@@ -57,7 +57,7 @@ class LuaLexer(RegexLexer):
 
     _comment_multiline = r'(?:--\[(?P<level>=*)\[[\w\W]*?\](?P=level)\])'
     _comment_single = r'(?:--.*$)'
-    _space = r'(?:\s+)'
+    _space = r'(?:\s+(?!\s))'
     _s = rf'(?:{_comment_multiline}|{_comment_single}|{_space})'
     _name = r'(?:[^\W\d]\w*)'
 
