Question

我想在一个特定的字符串中提取Hello世界当前我得到的是第一个和最后一个Occurences.there里面有三（3）个hello world文本，我希望它们出现在每个特定的字符串中。

String text="hellogfddfdfsdsworldhelloasaasasdasdggworldfdfdsdhellodasasddworld";
int x=text.indexOf("hello");
int y=text.indexOf("world");
String test=text.substring(x, y+4);
System.out.println(test);
x=text.indexOf("hello");
y=text.indexOf("world");
String test1=text.substring(x,y);
System.out.println(test1);
x=text.lastIndexOf("hello");
y=text.lastIndexOf("world);
String test2=text.substring(x, y);
System.out.println(test2);

Answer 1

听起来像正则表达式的工作。最简单的就是

List<String> matchList = new ArrayList<String>();
Pattern regex = Pattern.compile(
    "hello # Match 'hello'\n" +
    ".*?   # Match 0 or more characters (any characters), as few as possible\n" +
    "world # Match 'world'", 
    Pattern.COMMENTS);
Matcher regexMatcher = regex.matcher(subjectString);
while (regexMatcher.find()) {
    matchList.add(regexMatcher.group());
}

如果您只想在 hello和world之间使用，请使用

Pattern regex = Pattern.compile( "hello # Match 'hello'\n" + "(.*?) # Match 0 or more characters (any characters), as few as possible\n" + "world # Match 'world'", Pattern.COMMENTS); Matcher regexMatcher = regex.matcher(subjectString); while (regexMatcher.find()) { matchList.add(regexMatcher.group(1)); }

请注意，如果可以嵌套模式，则会失败，即：即hello foo hello bar world baz world。

提取字符串中的项目

1 个答案: