在Java中使用正则表达式获取字符串的子字符串

我在Java中使用正则表达式从字符串中提取子字符串时遇到了问题。例如，我有下面这根绳子

===Albedo–temperature feedback===
When an area's albedo changes due to snowfall, a snow–temperature [[feedback]] results. 

===Snow===
Snow albedo is highly variable, ranging from as high as 0.9 for freshly fallen snow, to about 0.4 for melting snow, and as low as 0.2 for dirty snow.

====Small-scale effects====
Albedo works on a smaller scale, too.

请注意，整个内容在一个字符串中

这里，在

==

之间显示的每个元素都是节标题，我想提取每个节内容及其标题（标题）

因此，我试图生成的输出如下所示

1. Albedo–temperature feedback
content: When an area's albedo changes due to snowfall, a snow–temperature [[feedback]] results.

2. Snow
content: Snow albedo is highly variable, ranging from as high as 0.9 for freshly fallen snow, to about 0.4 for melting snow, and as low as 0.2 for dirty snow.

2. Small-scale effects
content: Albedo works on a smaller scale, too.

我使用以下模式定义来提取标题

Pattern pattern = Pattern.compile("[=]{2,5}(.*?)[=]{2,5}");

这给了我，

反照率–温度反馈

，

雪

，

小尺度效果

现在我想要的是每个部分标题之间的内容。我无法提取它们。任何帮助都将不胜感激。

试试这个

String s = ""
    + "===Albedo–temperature feedback===\n"
    + "When an area's albedo changes due to snowfall, a snow–temperature [[feedback]] results. \n"
    + "\n"
    + "===Snow===\n"
    + "Snow albedo is highly variable, ranging from as high as 0.9 for freshly fallen snow, to about 0.4 for melting snow, and as low as 0.2 for dirty snow.\n"
    + "\n"
    + "====Small-scale effects====\n"
    + "Albedo works on a smaller scale, too.\n";
Pattern PAT = Pattern.compile("^()$|^={2,5}(.+?)={2,5}$|^(.+)$", Pattern.MULTILINE);
String NEWLINE = "\n";
Matcher m = PAT.matcher(s);
int number = 0;
StringBuilder sb = new StringBuilder();
while (m.find()) {
    if (m.group(2) != null)
        sb.append(++number).append(". ").append(m.group(2));
    else if (m.group(3) != null)
        sb.append("content: ").append(m.group(3));
    sb.append(NEWLINE);
}
System.out.println(sb.toString());

试试这个

String s = ""
    + "===Albedo–temperature feedback===\n"
    + "When an area's albedo changes due to snowfall, a snow–temperature [[feedback]] results. \n"
    + "\n"
    + "===Snow===\n"
    + "Snow albedo is highly variable, ranging from as high as 0.9 for freshly fallen snow, to about 0.4 for melting snow, and as low as 0.2 for dirty snow.\n"
    + "\n"
    + "====Small-scale effects====\n"
    + "Albedo works on a smaller scale, too.\n";
Pattern PAT = Pattern.compile("^()$|^={2,5}(.+?)={2,5}$|^(.+)$", Pattern.MULTILINE);
String NEWLINE = "\n";
Matcher m = PAT.matcher(s);
int number = 0;
StringBuilder sb = new StringBuilder();
while (m.find()) {
    if (m.group(2) != null)
        sb.append(++number).append(". ").append(m.group(2));
    else if (m.group(3) != null)
        sb.append("content: ").append(m.group(3));
    sb.append(NEWLINE);
}
System.out.println(sb.toString());

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我认为你需要考虑到你是跨多行匹配的。看看这个：我认为您需要考虑到您正在跨多行匹配。看看这个：