在字符串中查找句子

Question

我有字符串形式的文件内容。我需要在字符串中得到部分句子"My name is scott"的计数，该字符串可以跨越

这样的行

some content ... "My name is scott"  some content ...

some content ... "My name is " +  
    "scott"  some content ...

如果我可以获得两个版本，即第一个，以便在单行中找到给定的输入，那将是很好的。第二个也可以跨行搜索？

Answer 1

您可以使用replaceAll替换该中断部分：

" +  
    "

像这样：

String text = "some content ... \"My name is scott\"  some content ...\n"
        + "\n"
        + "some content ... \"My name is \" +  \n"
        + "    \"scott\"  some content ...";
String textToMatche = "My name is scott";
text = text.replaceAll("\"\\s*\\+\\s*\n\\s*\"", "");// Note the regex : \"\s*\+\s*\n\s*\"

结果：

some content ... "My name is scott"  some content ...

some content ... "My name is scott"  some content ...

然后计算出现次数：

Java 9+版

long count = Pattern.compile(Pattern.quote(textToMatche)).matcher(text).results().count();

在Java 9之前

Pattern p = Pattern.compile(Pattern.quote(textToMatche));
Matcher m = p.matcher(text);
int count = 0;
while (m.find()) {
    count += 1;
}

输出

2

ANSICON