Valid Number @LeetCode

于 2013-10-21 02:55:00 发布 · 64 阅读

这道题看了看网上的解法，很多都做得很麻烦。其实我觉得，这道题就是考察正则表达式。

package Level2;

/**
 * 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 S65 {

	public static void main(String[] args) {

	}

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

http://luolei.org/2013/09/regula-expression-simple-tutorial/

http://net.tutsplus.com/tutorials/php/regular-expressions-for-dummies-screencast-series/

http://deerchao.net/tutorials/regex/regex.htm