65. Valid Number (H)

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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.

One line with Regex:

public class Solution {    public boolean isNumber(String s) {        return s.matches(" *[+-]?(([0-9]*[.]?[0-9]+)|([0-9]+[.][0-9]*))([eE][+-]?[0-9]+)? *");    }}


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