如何在Java中提取字符串

Question

For example, I have a string as below:

<http://www.w3.org/2000/01/rdf-schema#label> "Telecommunications law"@en <http://en.wikipedia.org/wiki/> 

What is the easiest way to extract the substring:

Telecommunication law

Please note that the substring contains a space.

Answer 1

You could use Pattern and Matcher :

Pattern p = Pattern.compile("\".*\"");
Matcher m = p.matcher(s);

if(m.find()){
   String resultString = m.group();
}

In your case, resultString will contain ["Telecommunications law"] and you can trim the double quotes if you don't want to keep them.

Answer 2

String.split() the string on " , and select the second element in the returned array:

String tokens[] = yourString.split("\"");

// tokens[1] will contain Telecommunications law

Answer 3

what do you mean "extracting the string" ?

getting the first occurence of the string is by:

int index = string.indexOf("Telecommunications law");

the most efficient way of getting what is in between the first parenthesis and the second is by:

final String test="http://www.w3.org/2000/01/rdf-schema#label \"Telecommunications law\"@en http://en.wikipedia.org/wiki/";
final int firstIndex=test.indexOf('\"');
final int lastIndex=test.indexOf('\"',firstIndex+1);
final String result=test.substring(firstIndex+1,lastIndex);
System.out.println(result);

Answer 4

    public static void main(String[] args) {
 String str = "http://www.w3.org/2000/01/rdf-schema#label \"Telecommunications law\"@en http://en.wikipedia.org/wiki/" ;

 String temp = str.substring(str.indexOf('\"')+1, str.indexOf('\"',str.indexOf('\"')+1));
 System.out.print(temp);

    }

Answer 5

public static void main(String args[]){
String yourString = "<http://www.w3.org/2000/01/rdf-schema#label> \"Telecommunications law\"@en <http://en.wikipedia.org/wiki/>";
        String tokens[] = yourString.split("\"");

        for(int i = 0; i < tokens.length; i++){
            if(tokens[i].equals("Telecommunications law")){
                System.out.println(tokens[i]);
            }
        }
    }