我怎么能告诉一个字符串是否只包含使用正则表达式的python中的数字和空格

I'm trying to write some script in python (using regex) and I have the following problem:

我正在尝试在python中编写一些脚本（使用正则表达式），我有以下问题：

I need to make sure that a string contains ONLY digits and spaces but it could contain any number of numbers.

我需要确保一个字符串只包含数字和空格，但它可以包含任意数量的数字。

Meaning it should match to the strings: "213" (one number), "123 432" (two numbers), and even "123 432 543 3 235 34 56 456 456 234 324 24" (twelve numbers).

这意味着它应该匹配字符串：“213”（一个数字），“123 432”（两个数字），甚至“123 432 543 3 235 34 56 456 456 234 324 24”（十二个数字）。

I tried searching here but all I found is how to extract digits from strings (and the opposite) - and that's not helping me to make sure weather ALL OF THE STRING contains ONLY numbers (seperated by any amount of spaces).

我试着在这里搜索，但我发现的是如何从字符串中提取数字（和相反的方式） - 这并没有帮助我确保天气所有字符串只包含数字（由任意数量的空格分隔）。

Does anyone have a solution?

有没有人有办法解决吗？

If someone knows of a class that contains all the special characters (such as ! $ # _ -) it would be excellent (because then I could just do [^A-Z][^a-z][^special-class] and therefore get something that don't match any characters and special symbols - leaving me only with digits and spaces (if I'm correct).

如果有人知道包含所有特殊字符的类（例如！$＃_ - ），那就太棒了（因为那时我可以做[^ AZ] [^ az] [^ special-class]因此得到的东西不匹配任何字符和特殊符号 - 只留下数字和空格（如果我是正确的）。

3 个解决方案

#1

The basic regular expression would be

基本的正则表达式是

/^[0-9 ]+$/

However is works also if your string only contains space. To check there is at least one number you need the following

但是，如果您的字符串仅包含空格，则也可以。要检查至少有一个号码，您需要以下内容

/^ *[0-9][0-9 ]*$/

You can try it on there

你可以在那里试试

#2

This code will check if the string only contains numbers and space character.

此代码将检查字符串是否仅包含数字和空格字符。

if re.match("^[0-9 ]+$", myString):
    print "Only numbers and Spaces"

#3

Well I'd propose something that does not use regex:

好吧，我提出一些不使用正则表达式的东西：

>>> s = "12a 123"
>>> to_my_linking = lambda x: all(var.isdigit() for var in x.split())
>>> to_my_linking(s)
False
>>> s = "1244 432"
>>> to_my_linking(s)
True
>>> a = "123 432 543 3 235 34 56 456 456 234 324 24"
>>> to_my_linking(a)
True

In case you're working the lambda is just a simple way to make a one liner function. If we wrote it using a def, then it would look like this:

如果你正在工作，lambda只是制作单行功能的一种简单方法。如果我们使用def编写它，那么它看起来像这样：

>>> def to_my_linking(number_sequence):
...     return all(var.isdigit() for var in number_sequence.split())
...

#1