I'm looking for a regular expression that would validate a non-negative decimal (.NET type), i.e. if a non-negative value can be parsed using decimal.Parse(...), it should be considered valid. Otherwise invalid.
我正在寻找一个正则表达式来验证非负的小数(。NET类型)，即如果一个非负值可以使用decimal.Parse(…)进行解析，则应该认为它是有效的。否则无效。
I'm okay if it fails the 28-29 significant digits validation - relying on user's sanity here - and then we have another validation layer that would catch it anyway.
如果它没有通过28-29位有效数字验证(这里依赖于用户的健全程度)，那么我没问题，然后我们就有了另一个验证层，无论如何都可以捕获它。
Here is what I came up with:
以下是我的想法:
^(?:[1-9]\d*|0)?(?:\.\d+)?$
Problem is that it rejects 1. which is a valid number (you can verify from the immediate window in VS). Could be other edge cases I did not test. Please advise.
问题是它拒绝1。这是一个有效的数字(您可以从VS中的直接窗口验证)。可能是我没有测试的其他边缘情况。请建议。
P.S. I included ASP.NET and C# tags because this is for a web application written in C#, in which this regular expression is passed to a 3rd party component, which then works on the client (i.e. JS), so I cannot easily put custom code there (i.e. decimal.TryParse or smth like that).
注:我包括ASP。NET和c#标签，因为这是一个用c#编写的web应用程序，其中这个正则表达式被传递给第三方组件，然后在客户端(即JS)上工作，所以我不能轻易地在那里放置自定义代码(即decimal)。尝试解析或smth，像那样)。
1 个解决方案
#1
3
You can use this regex based on a negative lookahead to avoid matching single dot:
你可以使用这个正则表达式来避免匹配单个点:
^(?!\D+$)\+?\d*?(?:\.\d*)?$
-
(?!\D+$)is negative lookahead to assert failure when input is non digit characters - (?!\D+$)当输入为非数字字符时，为负前视以断言失败
-
?:\.\d*)?allows for matching123.type of number. - :\ \ d *)?123年允许匹配。类型的数。
RegEx演示1
RegEx演示2
#1
3
You can use this regex based on a negative lookahead to avoid matching single dot:
你可以使用这个正则表达式来避免匹配单个点:
^(?!\D+$)\+?\d*?(?:\.\d*)?$
-
(?!\D+$)is negative lookahead to assert failure when input is non digit characters - (?!\D+$)当输入为非数字字符时，为负前视以断言失败
-
?:\.\d*)?allows for matching123.type of number. - :\ \ d *)?123年允许匹配。类型的数。
RegEx演示1
RegEx演示2