NumExtractorFromString.java

/**
 * Extract digit from string
 */
public class Test {
    public static void main(String[] args) {
        String str = "0b1100100";
        str = new String(str.replaceAll("\\D+", ""));

        int n = Integer.parseInt(str, 2);
        System.out.println(n);

        // This work if your number has a decimal point
        String str2 = "foo 2.36 bar";
        str2 = str2.replaceAll("[^\\.0123456789]","");
        System.out.println(str2);
    }
}