Can you explain the functioning of the {m,n}? regex in the Python re module?

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Yes, the {m,n} in the Python re module is used to specify the minimum and maximum number of occurrences of a pattern.

For example, if we want to search for a pattern that occurs between 2 and 4 times in a string, we can use {2,4}.

Here's an example:

import re

pattern = r'a{2,4}'   # Searches for pattern 'a' that occurs between 2 to 4 times
text = 'aaaa aa a'

result = re.findall(pattern, text)
print(result)

# Output: ['aaaa', 'aaaa']

In this example, the {2,4} specifies that we are looking for the pattern 'a' that occurs between 2 and 4 times. The re.findall function returns all the matches found in the text string.

Note that if the minimum value is not specified, it defaults to 0, and if the maximum value is not specified, it defaults to infinity. So, {3,} means minimum 3 occurrences and no maximum limit, and {,5} means maximum 5 occurrences and no minimum limit.