Regex | Matching Same Text Again & Again

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Example

You have a test string S.
Your task is to write a regex that will match S with the following conditions:

  • S must be of length: 20
  • 1st character: lowercase letter.
  • 2nd character: word character.
  • 3rd character: whitespace character.
  • 4th character: non-word character.
  • 5th character: digit.
  • 6th character: non-digit.
  • 7th character: uppercase letter.
  • 8th character: letter (either lowercase or uppercase).
  • 9th character: vowel (a, e, i, o, u, A, E, I, O, or U).
  • 10th character: non-whitespace character.
  • 11th character: should be the same as the 1st character.
  • 12th character: should be the same as the 2nd character.
  • 13th character: should be the same as the 3rd character.
  • 14th character: should be the same as the 4th character.
  • 15th character: should be the same as the 5th character.
  • 16th character: should be the same as the 6th character.
  • 17th character: should be the same as the 7th character.
  • 18th character: should be the same as the 8th character.
  • 19th character: should be the same as the 9th character.
  • 20th character: should be the same as the 10th character.
Regex_Pattern = r'([a-z])(\w)(\s)(\W)(\d)(\D)([A-Z])([a-zA-Z])([aeiouAEIOU])(\S)\1\2\3\4\5\6\7\8\9\10'

import re

print(str(bool(re.search(Regex_Pattern, input()))).lower())

Theory

This tool (\1 references the first capturing group) matches the same text as previously matched by the capturing group.


Source: https://yellorn.com/programming/regex-matching-same-text-again-again

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