Practice>Python>Regex and Parsing>Validating Postal Codes

hackerrank.com

Validating Postal Codes

Problem Link : https://www.hackerrank.com/challenges/validating-postalcode/problem

Difficulty : Hard

 

Tip

• 100000~999999
• [1-9]{1}[0-9]{5}$ <- don't forget '$'
• Lookahead is key
• (?=(\d)\d\1)
• Find one digit by using lookahead
• Find one more repeat which is captured previously

 

Solution

regex_integer_in_range = r"[1-9]{1}[0-9]{5}$" regex_alternating_repetitive_digit_pair = r"(?=(\d)\d\1)" import re P = input() print (bool(re.match(regex_integer_in_range, P)) and len(re.findall(regex_alternating_repetitive_digit_pair, P)) < 2)