leetcode Valid Number 2.15 难度系数2

Question：

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) {  
        String sRegex = s.trim();
        if(sRegex.isEmpty()){  
            return false;  
        }  
        String target = "[+-]?(\\.\\d+|\\d+\\.?)\\d*(e[+-]?\\d+)?";  
        if(sRegex.matches(target)){  
            return true;  
        }else{  
            return false;  
        }  
    }  
}