多次正则表达式两个字符串之间的所有内容答案

【问题标题】：Regex everything between two strings multiple times多次正则表达式两个字符串之间的所有内容
【发布时间】：2014-03-19 13:41:49
【问题描述】：

我有一个类似

的字符串

[{"id":"9","label":"P","price":"0","oldPrice":"0","products":["606","610","614","618","622","625","629"]},{"id":"8","label":"M","price":"0","oldPrice":"0","products":["607","611","615","619","626","630"]},{"id":"7","label":"G","price":"0","oldPrice":"0","products":["609","613","617","621","624","628","632"]},{"id":"36","label":"GG","price":"0","oldPrice":"0","products":["608","612","616","620","623","627","631"]},{"id":"152","label":"XGG","price":"0","oldPrice":"0","products":["3713","6577","6578","6579","6580","6581","6582"]}]

我需要的是标签值：P、M、G、GG、XGG。我试图获取标签和逗号之间的所有内容，但它不起作用

"(标签)(.*)(,)"

【问题讨论】：

标签： java regex string matcher

【解决方案1】：

(?<=label\"\:)\"\w+\"

这样就可以了

或者如果你真的想把它解析为 json

这样做

var arr = [];
var jso = [{"id":"9","label":"P","price":"0","oldPrice":"0","products":["606","610","614","618","622","625","629"]},{"id":"8","label":"M","price":"0","oldPrice":"0","products":["607","611","615","619","626","630"]},{"id":"7","label":"G","price":"0","oldPrice":"0","products":["609","613","617","621","624","628","632"]},{"id":"36","label":"GG","price":"0","oldPrice":"0","products":["608","612","616","620","623","627","631"]},{"id":"152","label":"XGG","price":"0","oldPrice":"0","products":["3713","6577","6578","6579","6580","6581","6582"]}];
console.log(jso.length);
for(var i=0;i<jso.length;i++){
    arr.push(jso[i].label);
}
console.log(arr);

正则表达式演示：http://regex101.com/r/kT9kE6

【讨论】：

【解决方案2】：

此字符串为 JSON 格式，因此建议使用 JSON 解析器而不是使用正则表达式

在http://www.json.org/ 中了解 JSON 格式。

此链接提供有关 java http://www.json.org/java/ 中 JSON 的说明

【讨论】：

谢谢，我知道它是 JSON 格式，但我不能使用解析器，它是来自网络爬虫的 String 对象，我无法更改。
您可以解析字符串中存在的 JSON 内容

【解决方案3】：

你的正则表达式很贪心。

改成懒人

label.*?,

您还可以使用条件正则表达式仅获取标签值

使用条件表达式的正则表达式

(?<="label":")\w+

Regex Demo

【讨论】：

【解决方案4】：

您可能应该使用 JSON 解析器，但是...

此正则表达式将捕获组名称“标签”中的所有标签

.*?(?:label)":"(?<labels>[^"]+)+.*?

或者根据你的执行方式，只需搜索这个匹配项

(?:label)":"(?<labels>[^"]+)

你可以在这里看到它的工作原理：http://regex101.com/r/fS8jA8

以及生成的 JAVA（由 regex101 生成）：

String re = "(?:label)\\":\\"(?<labels>[^\\"]+)";
String str = "[{\"id\":\"9\",\"label\":\"P\",\"price\":\"0\",\"oldPrice\":\"0\",\"products\":[\"606\",\"610\",\"614\",\"618\",\"622\",\"625\",\"629\"]},{\"id\":\"8\",\"label\":\"M\",\"price\":\"0\",\"oldPrice\":\"0\",\"products\":[\"607\",\"611\",\"615\",\"619\",\"626\",\"630\"]},{\"id\":\"7\",\"label\":\"G\",\"price\":\"0\",\"oldPrice\":\"0\",\"products\":[\"609\",\"613\",\"617\",\"621\",\"624\",\"628\",\"632\"]},{\"id\":\"36\",\"label\":\"GG\",\"price\":\"0\",\"oldPrice\":\"0\",\"products\":[\"608\",\"612\",\"616\",\"620\",\"623\",\"627\",\"631\"]},{\"id\":\"152\",\"label\":\"XGG\",\"price\":\"0\",\"oldPrice\":\"0\",\"products\":[\"3713\",\"6577\",\"6578\",\"6579\",\"6580\",\"6581\",\"6582\"]}]
";

Pattern p = Pattern.compile(re, Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(str);

【讨论】：