What is the regular expression in Python for digits that are repeated, but not necessarily in sequence?

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The regular expression in Python for digits that are repeated but not necessarily in sequence is:

(\d).*\1

This expression matches any digit that appears at least twice in a string.

• (\d) captures a digit
• .* matches any number of characters (including digits)
• \1 matches the same digit captured by the first group

Example:

import re

string = "1234567891011"
pattern = re.compile(r'(\d).*\1')
matches = pattern.findall(string)

print(matches)   # Output: ['1']

In the above example, the pattern matches the digit '1' because it appears twice in the string: once as the first digit and again as part of the number '11'.