正则表达式匹配问题！

[tedagov328281]

在一个文件中有这样的字符串

PRIMARY INDEX
INDEX
INDEX
INDEX



要求匹配出前面没有出现PRIMARY关键字的字符串"INDEX"

[malligator]

"(?<!PRIMARY)\\s+INDEX"

[malligator]

String str = "A is a PRIMARY INDEX but B just is an INDEX!";
		Pattern pattern = Pattern.compile("(?<!PRIMARY)\\s+INDEX");
		Matcher matcher = pattern.matcher(str);
		while(matcher.find()){
			System.out.println("Appears in index " + matcher.start() + " to " + matcher.end());
		}

[tedagov328281]

java.util.regex.PatternSyntaxException: Unknown inline modifier near index 2
(? <!PRIMARY)\s+INDEX[^\)]+\)
^


去掉空格也匹配不出来

[tedagov328281]

(?<!PRIMARY\\s)INDEX


这样可以了