Practice>Python>Regex and Parsing>Re.start() & Re.end()

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Re.start() & Re.end()

Problem Link : https://www.hackerrank.com/challenges/re-start-re-end/problem

Difficulty : Easy

Tip

• re.search() start() and end() methods are described in problme description
• re.finditer() is a key method, as it return all occurences which is matched with given regular expression
• start() == end() from re.finditer() 
• start() != end() from re.search() 
• So, we should use start() and start() + len(k) -`1

Solution

import re s, k = input(), input() ptn = r'(?='+k+')' matches = list(re.finditer(ptn, s)) if matches: for match in matches: print((match.start(), match.start() + len(k) - 1)) #print(match.start(), match.end()) else: print('(-1, -1)')