Example
You have a test String S.
Write a regex which can match all the occurences of characters which are not immediately preceded by vowels (a, e, i, u, o, A, E, I, O, U).
Input: 1o1s
Output: Number of matches : 3
Regex_Pattern = r"(?<![aeiuoAEIOU])."
import re
Test_String = input()
match = re.findall(Regex_Pattern, Test_String)
print("Number of matches :", len(match))
Theory
(?<!regex_2)regex_1
The negative lookbehind (?<!) asserts regex_1 not to be immediately preceded by regex_2. Lookbehind is excluded from the match (do not consume matches of regex_2), but only assert whether a match is possible or not.
Source: https://yellorn.com/programming/regex-negative-lookbehind
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