Return all regex matches in list

Question

Trying to get all matches in my list in the correct form. example:

import re

regex = re.compile(r'(\d{1,4})')
text = ['(261, 264)', '(458, 393)', '(960, 540)', '(542, 424)', '(541, 424)']
print(regex.findall(text[0]))
print(list(filter(regex.findall, text)))

outputs:

['261', '264']
['(261, 264)', '(458, 393)', '(960, 540)', '(542, 424)', '(541, 424)']

I'm trying to get the bottom part in the same format as the top (without the parenthesis or comma). Is this possible? I can't seem to get these functions to return all matches in my list (I want to make it in 1 line like the list(filter()) is if at all possible)

edit:: desired output:

['261', '264', '458', '393', '960', '540', '542', '424', '542', '424']

Answer 1

Try this:

import re

regex = re.compile(r'(\d{1,4})')
text = ['(261, 264)', '(458, 393)', '(960, 540)', '(542, 424)', '(541, 424)']
print(regex.findall(text[0]))
print([elem for tup in map(regex.findall, text) for elem in tup])

Answer 2

list comprehension that merges all matches (by iterating over all of them):

import re

regex = re.compile(r'(\d{1,4})')
text = ['(261, 264)', '(458, 393)', '(960, 540)', '(542, 424)', '(541, 424)']

print([x for t in text for x in regex.findall(t)])

Answer 3

Here is my solution:

Explaining

1. Find the matches per each element you have in the list (just like you did)

This will leave you with the following result:

[['261', '264'],
 ['458', '393'],
 ['960', '540'],
 ['542', '424'],
 ['541', '424']]

2. Flatten this list:

Which will leave you with the result you want

['261', '264', '458', '393', '960', '540', '542', '424', '541', '424']

Final Code

import itertools
import re

original_list =  ['(261, 264)', '(458, 393)', '(960, 540)', '(542, 424)', '(541, 424)']
regex =  re.compile(r"\d\d\d")


matches_per_element = [regex.findall(txt) for txt in original_list]
flattened_list = list(itertools.chain(*matches_per_element))


### Display the result
print(flattened_list)
>>> ['261', '264', '458', '393', '960', '540', '542', '424', '541', '424']