Write a regular expression that will match all the positive numbers in a string with numbers separated by spaces. You must use RegEx negative lookbehind.

txt = "23 -43 34 -44 45 -55 56"
pattern = "yourregularexpressionhere"

re.findall(pattern, txt) ➞ ["23", "34", "45", "56"]

Notes

• You don't need to write a function, just the pattern.
• Do not remove import re from the code.
• Find more info on RegEx and negative lookbehind in Resources.
• You can find all the challenges of this series in my Basic RegEx collection.