update expression grammar to handle parens around cond
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@@ -61,6 +61,7 @@ extern int column;
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%option noyywrap nounput
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/* UTF-8 unicode regular expressions. */
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/* http://www.unicode.org/reports/tr44/#General_Category_Values */
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Cc ([\x00-\x1f\x7f]|\xc2[\x80-\x9f])
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Cf (\xc2\xad|\xd8[\x80-\x85\x9c]|\xdb\x9d|\xdc\x8f|\xe1(\xa0\x8e)|\xe2(\x80[\x8b-\x8f\xaa-\xae]|\x81[\xa0-\xa4\xa6-\xaf])|\xef(\xbb\xbf|\xbf[\xb9-\xbb])|\xf0(\x91(\x82\xbd))|\xf3(\xa0(\x80\x81)))
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