Pattern p=Pattern.compile("\\d+"); Matcher m=p.matcher("22bb

Pattern p=Pattern.compile("\\d+"); Matcher m=p.matcher("22bb23"); System.out.println(m.matches()); Matcher m2=p.matcher("2223"); System.out.println(m2.matches());运行结果为：

A.false true

B.true false

C.true true

D.false false

正确答案是A