String dataIWant = mydata.replaceFirst(".*'(.*?)'.*", "$1");

String dataIWant = mydata.replaceFirst(".*'(.*?)'.*", "$1");

你不需要正则表达式。

将apache commons lang添加到您的项目(http://commons.apache.org/proper/commons-lang/)，然后使用:

String dataYouWant = StringUtils.substringBetween(mydata, "'");

假设你想要单引号之间的部分，使用一个Matcher正则表达式:

"'(.*?)'"

例子:

String mydata = "some string with 'the data i want' inside";
Pattern pattern = Pattern.compile("'(.*?)'");
Matcher matcher = pattern.matcher(mydata);
if (matcher.find())
{
    System.out.println(matcher.group(1));
}

结果:

the data i want

在javascript中:

mydata.match(/'([^']+)'/)[1]

实际的regexp是:/'([^']+)'/

如果你使用非贪婪修饰符(另一篇文章)，它是这样的:

mydata.match(/'(.*?)'/)[1]

它更干净。

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test {
    public static void main(String[] args) {
        Pattern pattern = Pattern.compile(".*'([^']*)'.*");
        String mydata = "some string with 'the data i want' inside";

        Matcher matcher = pattern.matcher(mydata);
        if(matcher.matches()) {
            System.out.println(matcher.group(1));
        }

    }
}