How to read numbers after followed by particular Character of a string using Java Android?

String str = "[amt is E234.98.valid 23/12/2013.Sample text]"

How to read only the amount value from the above sample string which is near after to the character "E".

You can use regexp and matching groups to extract what you need.

CODE update:

Use by calling ParseWithRegexp.testIt()

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

public class ParseWithRegexp {
    static String str = "[amt is E234.98.valid 23/12/2013.Sample text  E134.95.valid 23/12/2015]";
    public static void testIt() {
        Pattern p = Pattern.compile("E([0-9.]+)\\.valid");
        Matcher m = p.matcher(str);
        while (m.find()) {
            System.out.println("found: "+m.group(1));
        }
    }
}

Upadte: You can be more strict with the regexp, for example: "E([0-9]+\\.[0-9]+)"