[leedcode 65] Valid Number

Validate if a given string is numeric.

Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true

Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.

public class Solution {
    public boolean isNumber(String s) {
        //".1"  true;
        //正则表达式：参考http://blog.csdn.net/sbitswc/article/details/32378587
        //*    重复零次或更多次
        //+    重复一次或更多次
        //?    重复零次或一次
         if(s.trim().isEmpty())  
            return false;  
        String regex = "[-+]?(\d+\.?|\.\d+)\d*(e[-+]?\d+)?";  
        if(s.trim().matches(regex))  
            return true;  
        else  
            return false; 
    }
}