如何使用正则表达式提取字符串的这一部分

Question

我有以下字符串

  var tabContents = {"1":"<div class=\"ProductDetail\"><h2 class=\"h2_style\" style=\"margin: 0px 0px 15px; padding: 0px; border: 0px; vertical-align: baseline; font-weight: normal; color: rgb(0, 102, 153); letter-spacing: 0.3px; font-size: 16px; text-align: center; font-family: 'Lucida Grande', sans-serif; font-style: normal; font-variant: normal; line-height: 16px; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webv><\/div>","2":"","3":"","4":""};

现在我想得到这个部分

<div class=\"ProductDetail\"><h2 class=\"h2_style\" style=\"margin: 0px 0px 15px; padding: 0px; border: 0px; vertical-align: baseline; font-weight: normal; color: rgb(0, 102, 153); letter-spacing: 0.3px; font-size: 16px; text-align: center; font-family: 'Lucida Grande', sans-serif; font-style: normal; font-variant: normal; line-height: 16px; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webv><\/div>

因此该部分以"1":"开头，以","2"

结尾

如何在这两个标记点之间获取字符串？

C＃.net 4.5

Answer 1

使用捕获组或外观。

"1":"(.*?)","2"

使用上述正则表达式并从组索引1中获取所需的字符串。

DEMO

或

(?<="1":").*?(?=","2")

使用上面的正则表达式并从组索引0获取所需的字符串。

• (?<="1":")肯定的背后隐藏，断言匹配必须以"1":"开头。

• .*?任意字符零次或多次出现的非贪婪匹配。

• (?=","2")确定匹配必须跟","2"

的正向前瞻

DEMO

String input = @"var tabContents = {""1"":""<div class=\""ProductDetail\""><h2 class=\""h2_style\"" style=\""margin: 0px 0px 15px; padding: 0px; border: 0px; vertical-align: baseline; font-weight: normal; color: rgb(0, 102, 153); letter-spacing: 0.3px; font-size: 16px; text-align: center; font-family: 'Lucida Grande', sans-serif; font-style: normal; font-variant: normal; line-height: 16px; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webv><\/div>"",""2"":"""",""3"":"""",""4"":""""};";
Regex rgx = new Regex(@"""1"":""(.*?)"",""2""");
foreach (Match m in rgx.Matches(input))
Console.WriteLine(m.Groups[1].Value);

输出：

<div class=\"ProductDetail\"><h2 class=\"h2_style\" style=\"margin: 0px 0px 15px; padding: 0px; border: 0px; vertical-align: baseline; font-weight: normal; color: rgb(0, 102, 153); letter-spacing: 0.3px; font-size: 16px; text-align: center; font-family: 'Lucida Grande', sans-serif; font-style: normal; font-variant: normal; line-height: 16px; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webv><\/div>

IDEONE