python正则表达式“12x4x67”只匹配第二组数字

Question

all i am a little stuck on this regular expression (Python beginner) I have a string here "12x4x67" and I need to split the numbers up into variables, for example: length, width and height. I have successfully gotten the first group. Now I need to match the second group. Here's a link to the regex tester I am using with the example I made.

Here is my regex :

\d+

It only matches 340 in 340x9x20 .

Answer 1

No regular expression needed:

length, width, height = "12x4x67".split('x')

Or if you prefer dealing with integers:

length, width, height = [int(s) for s in "12x4x67".split('x')]

Answer 2

If your input always has all 3 parts - length, width and height - you can use

(?P<length>\d+)x(?P<width>\d+)x(?P<height>\d+)

See regex demo

With named captures, you will be able to access any of the parts via a named group.

Python sample code :

import re
p = re.compile(r'(?P<length>\d+)x(?P<width>\d+)x(?P<height>\d+)')
s = "340x9x20"
m = p.search(s)
if (m):
    print(m.groupdict())
    # => {'length': '340', 'width': '9', 'height': '20'}
    print({k:int(v) for k,v in m.groupdict().items()})
    # => {'length': 340, 'width': 9, 'height': 20}

Answer 3

I would prefer the split approach, but to answer your question about regexps - this will use \\d+ to find ALL occurences:

lwh = "340x9x20"
numbers = [int(n) for n in re.findall("\d+", lwh)]
print(numbers)       # [340,9,20]

this can be optimized by using a pre-compiled regexp.