Practice>Python>Regex and Parsing>Re.findall() & Re.finditer()

hackerrank.com

Re.findall() & Re.finditer()

Problem Link : https://www.hackerrank.com/challenges/re-findall-re-finditer/problem

Difficulty : Easy, this is not easy, it should be Medium at lest

Tip

• Problem is not easy, and quite tricky
• We are going to approach a bit different, unlike discussion in the problem.
• Cs is consonants
• Vs is vowels
• Pattern is like [Cs][Vs][Vs]+[Cs]
• Find this pattern first
• Remove Cs in both beginning, and ending
• Print only vowels
• And replace found vowel from string
• We repeat it until, we don't find the pattern

Solution

import re Consonants = 'BCDFGHJKLMNPQRSTVWXZbcdfghjklmnpqrstvwx' Vowels = 'AEIOUaeiou' s = input() reg_cvvc = r'['+Consonants+']['+Vowels+']['+Vowels+']+['+Consonants+']' reg_vv = r'['+Vowels+']['+Vowels+']+' bFirst = True bLoop = True while bLoop: matches = re.findall(reg_cvvc, s) if len(matches) <= 0: if bFirst: print(-1) break; bFirst = False #print(matches[0]) only_vowels = re.findall(reg_vv, matches[0]) print(only_vowels[0]) s = s.replace(only_vowels[0], '', 1)