在java中提取两个字符串之间的字符串
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Extract string between two strings in java
提问by Tien Nguyen
I try to get string between <%= and %>, here is my implementation:
我尝试在 <%= 和 %> 之间获取字符串，这是我的实现：
String str = "ZZZZL <%= dsn %> AFFF <%= AFG %>";
Pattern pattern = Pattern.compile("<%=(.*?)%>");
String[] result = pattern.split(str);
System.out.println(Arrays.toString(result));
it return
它返回
[ZZZZL , AFFF ]
But my expectation is:
但我的期望是：
[ dsn , AFG ]
Where am i wrong and how to correct it ?
我错在哪里以及如何纠正它？
采纳答案by jlordo
Your pattern is fine. But you shouldn't be split()ting it away, you should find()it. Following code gives the output you are looking for:
你的模式很好。但你不应该把split()它丢掉，你应该find()这样做。以下代码提供了您正在寻找的输出：
String str = "ZZZZL <%= dsn %> AFFF <%= AFG %>";
Pattern pattern = Pattern.compile("<%=(.*?)%>", Pattern.DOTALL);
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println(matcher.group(1));
}
回答by Henry Keiter
Your regex looks correct, but you're splittingwith it instead of matchingwith it. You want something like this:
您的正则表达式看起来是正确的，但您splitting使用它而不是matching使用它。你想要这样的东西：
// Untested code
Matcher matcher = Pattern.compile("<%=(.*?)%>").matcher(str);
while (matcher.find()) {
System.out.println(matcher.group());
}
回答by Zon
Jlordo approach covers specific situation. If you try to build an abstract method out of it, you can face a difficulty to check if 'textFrom' is before 'textTo'. Otherwise method can return a match for some other occurance of 'textFrom' in text.
Jlordo 方法涵盖特定情况。如果您尝试从中构建抽象方法，您可能会面临检查“ textFrom”是否在“ textTo”之前的困难。否则，方法可以返回textFrom文本中其他出现的“ ”的匹配项。
Here is a ready-to-go abstract method that covers this disadvantage:
这是一个现成的抽象方法，它涵盖了这个缺点：
/**
* Get text between two strings. Passed limiting strings are not
* included into result.
*
* @param text Text to search in.
* @param textFrom Text to start cutting from (exclusive).
* @param textTo Text to stop cuutting at (exclusive).
*/
public static String getBetweenStrings(
String text,
String textFrom,
String textTo) {
String result = "";
// Cut the beginning of the text to not occasionally meet a
// 'textTo' value in it:
result =
text.substring(
text.indexOf(textFrom) + textFrom.length(),
text.length());
// Cut the excessive ending of the text:
result =
result.substring(
0,
result.indexOf(textTo));
return result;
}
回答by Pini Cheyni
I have answered this question here: https://stackoverflow.com/a/38238785/1773972
我在这里回答了这个问题：https: //stackoverflow.com/a/38238785/1773972
Basically use
基本使用
StringUtils.substringBetween(str, "<%=", "%>");
This requirs using "Apache commons lang" library: https://mvnrepository.com/artifact/org.apache.commons/commons-lang3/3.4
这需要使用“Apache commons lang”库：https: //mvnrepository.com/artifact/org.apache.commons/commons-lang3/3.4
This library has a lot of useful methods for working with string, you will really benefit from exploring this library in other areas of your java code !!!
这个库有很多有用的处理字符串的方法，你会真正受益于在你的 Java 代码的其他领域探索这个库！！！
