seeking simple|clean|pythonic way to capture {1,} numeric clusters

[NetPCDoc]

seeking simple|clean|pythonic way (expression | pattern) to capture {1,} numeric clusters (i.e. "\d+") …
… associated with a single "key_phrase"?

(I am having great difficulty with finding proper search terms for any posted examples.)

---

goal:

• 'Match 1 0-c "key_phrase [22 1 333 ...]"'
• 'Group <int> 12-14 "22"'
• 'Group <int> 15-16 "1"'
• 'Group <int> 17-20 "333"'
• …
• 'Group <int> a-b "\d+"'
  • where:
    • 20 < a <= b < c == b + 1

---

using (for testing purposes):

• 'Python 2.7 "flavor"' at regex101
• test_string = 'key_phrase [22 1 333]'

attempts (with partial success):

• regex = 'r"key_phrase \[(\d+)+(?: |\])"gm'
  • results:
    • 'Match 1 0-15 "key_phrase [22 "'
    • 'Group 1 12-14 "22"'

• regex = 'r"key_phrase \[(?:(?: )*(\d+))+\]"gm'
  • results:
    • 'Match 1 0-21 "key_phrase [22 1 333]"'
    • 'Group 1 17-20 "333"'

• regex = 'r"key_phrase \[((?:(?: )*(?:\d+))+)\]"gm'
  • results:
    • 'Match 1 0-21 "key_phrase [22 1 333]"'
    • 'Group 1 12-20 "22 1 333"'

attempt (with complicated|messy|unpythonic, but successful?, result):

• regex = 'r"key_phrase \[|(?: )*(\d+)|\]"gm'
  • results:
    • 'Match 1 0-12 "key_phrase ["'
    • 'Match 2 12-14 "22"'
    • 'Group 1 12-14 "22"'
    • 'Match 3 14-16 " 1"'
    • 'Group 1 15-16 "2"'
    • 'Match 4 16-20 " 333"'
    • 'Group 1 17-20 "333"'
    • 'Match 5 20-21 "]"'

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Notes:

• neither "(?:(?<=\[| )(\d+))+" nor "(\?:(\d+)(?= |\])+" are satisfactory as capture-group expressions.

• '{1,} numeric clusters' is my way of stating :
  • want to ignore any "key_phrase []" potential matches, while capturing an unknown number of \d+ integers
  • (i.e. there could be only one or a multiple number - up to, at least, as many as can fit on a single line - \d+ groups).

• the '22 1 333' in test_string was selected as a sample of what MIGHT be encountered.