Question

How can I extract the value of the bookid from this string using Java?

href="http://www.books.com/?bookname=cooking&bookid=12345678&bookprice=123.45">cooking book

Answer 1

Normally you should use some parser but if your String is really this short then maybe regular expression can be option like

String s="href=\"http://www.books.com/?bookname=cooking&bookid=12345678&bookprice=123.45\">cooking book";
Pattern p= Pattern.compile("(?<=bookid=)\\d+");
Matcher m=p.matcher(s);
if (m.find())
    System.out.println(m.group());

output:

12345678