1.是否匹配
String a=”1111a”;
boolean f=a.matches(“^\d+$”);
System.out.println(f);
2.查找匹配项
Pattern p=Pattern.compile(“ab”);
String u=”abcdefsfsaffsabadfewfadfgea”;
Matcher m=p.matcher(u);
int i=0;
while(m.find()){
i++;
}
System.out.println(i);