java 正则表达式怎么用啊？

Question

java 正则表达式怎么用啊

Answer 1

几种方法。String a="123345";a.matches("\\d");///Pattern p=Pattern.compile("ab");String u="abcdefsfsaffsabadfewfadfgea";Matcher m=p.matcher(u);int i=0;while(m.find()){i++;}System.out.println(i);