I have this String extracted from a body of an e-mail
"DESTINATION: 71222222 PRIORITY: urgent AUTRE: rien"
I am looking to extract the strings "71222222", "urgent" and "rien".
I have tried the class Scanner but it did not work.
Which is the best solution to do it in Java?
You can use regular expressions, like this:
String s = "#DESTINATION: 71222222\n"+
"#PRIORITY: urgent\n"+
"#AUTRE: rien";
Pattern p = Pattern.compile("(?<=: )[^ ]+$", Pattern.MULTILINE);
Matcher m = p.matcher(s);
while(m.find()) {
System.out.println(m.group(0));
}
The core of this solution is this regular expression: (?<=: )[^ ]+$. It matches a sequence of non-space characters that follow colon+space ": " sequence all the way to the end of line $.
Demo on ideone: link.
try this
String text = "DESTINATION: 71222222 PRIORITY: urgent AUTRE: rien";
String[]lines = text.replace(": ", ":").split(" ");
String[]values = new String[lines.length];
int i=0;
for(String line : lines){
values[i++] = line.split(":")[1];
}
System.out.println(Arrays.toString(values));
the output is
[ 71222222, urgent, rien]
you can also try this
String text = "DESTINATION: 71222222 PRIORITY: urgent AUTRE: rien";
StringTokenizer tokinizer = new StringTokenizer(text,": ");
while(tokinizer.hasMoreTokens()) {
tokinizer.nextToken(); //skip first
System.out.println(tokinizer.nextToken());
}
You can definitely use a Scanner to extract the information you need:
final String input = "DESTINATION: 71222222 PRIORITY: urgent AUTRE: rien";
final Scanner scanner = new Scanner(input).useDelimiter("\\w+: ");
while(scanner.hasNext()) {
System.out.println(scanner.next());
}
This prints:
71222222
urgent
rien
Try this. It uses regex to split the string by white space (\s)
String str = "DESTINATION: 71222222 PRIORITY: urgent AUTRE: rien";
String[] split = str.split("\\s");
System.out.println(split[1]+" - "+split[3]+" - "+split[5]);
Correction: when the question first came in the input string included line-feeds. It looks like now the question has been edited to remove the line-feeds. If they are no longer there then my solution won't work.
My first thought is to write a parsing routine that creates a map of key/value pairs. Then you can fetch the data pieces by name and the order in the string doesn't matter.
import java.util.HashMap;
import java.util.Map;
class Main
{
/**
* This method parses a string of "key:value" pairs into a map. Parameter
* pairs are separated by new-lines.
* @param in the string to parse
* @return the data map
*/
static Map<String,String> parseParameters(String in) {
Map<String,String> params = new HashMap<String,String>();
int pos = 0;
while(pos<in.length()) {
int i = in.indexOf("\n",pos);
if(i<0) i=in.length();
String sub = in.substring(pos,i);
pos = i+1;
int j = sub.indexOf(":");
if(j>=0) {
String key = sub.substring(0,j).trim();
String val = sub.substring(j+1).trim();
//System.out.println(key+":"+val);
params.put(key,val);
}
}
return params;
}
public static void main( String args[] )
{
String in = "#DESTINATION: 71222222\n#PRIORITY: urgent\n#AUTRE: rien";
Map<String,String> params = parseParameters(in);
// Get the data pieces by name
System.out.println(params.get("#AUTRE"));
System.out.println(params.get("#DESTINATION"));
System.out.println(params.get("#PRIORITY"));
}
}
.split(" ").