LeetCode 86 Valid Number

发布时间：2020-12-14 01:33:10 所属栏目：百科来源：网络整理

导读：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 imp

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.

分析：

判断字符串是否满足满足某些规则，应该想到正则表达式。

public class Solution {
    public boolean isNumber(String s) {
        
        if(s == null || s.trim().length()==0)
            return false;
        String regex = "[-+]?(d+.?|.d+)d*(e[-+]?d+)?";
        if(s.trim().matches(regex))
            return true;
        return false;
    }
}

（编辑：李大同）

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