Algorithm


Problem Name: Python - Group(), Groups() & Groupdict()

Problem Link: https://www.hackerrank.com/challenges/re-group-groups/problem?isFullScreen=true

In this HackerRank Functions in PYTHON problem solution,

group()

 

A group() expression returns one or more subgroups of the match.
Code

 

>>> import re
>>> m = re.match(r'(\w+)@(\w+)\.(\w+)','username@hackerrank.com')
>>> m.group(0)       # The entire match 
'username@hackerrank.com'
>>> m.group(1)       # The first parenthesized subgroup.
'username'
>>> m.group(2)       # The second parenthesized subgroup.
'hackerrank'
>>> m.group(3)       # The third parenthesized subgroup.
'com'
>>> m.group(1,2,3)   # Multiple arguments give us a tuple.
('username', 'hackerrank', 'com')

 


 

groups()

 

A groups() expression returns a tuple containing all the subgroups of the match.
Code

 

>>> import re
>>> m = re.match(r'(\w+)@(\w+)\.(\w+)','username@hackerrank.com')
>>> m.groups()
('username', 'hackerrank', 'com')

 


 

groupdict()

 

A groupdict() expression returns a dictionary containing all the named subgroups of the match, keyed by the subgroup name.
Code

 

>>> m = re.match(r'(?P<user>\w+)@(?P<website>\w+)\.(?P<extension>\w+)','myname@hackerrank.com')
>>> m.groupdict()
{'website': 'hackerrank', 'user': 'myname', 'extension': 'com'}

 


 

Task

You are given a string S.

Your task is to find the first occurrence of an alphanumeric character in S (read from left to right) that has consecutive repetitions.

Input Format

A single line of input containing the string S.

Constraints

0 < len(S) < 100

Output Format

Print the first occurrence of the repeating character. If there are no repeating characters, print -1.

Sample Input

..12345678910111213141516171820212223

Sample Output

1

Explanation

.. is the first repeating character, but it is not alphanumeric.
1 is the first (from left to right) alphanumeric repeating character of the string in the substring 111

 

 

 

 

Code Examples

#1 Code Example with Python Programming

Code - Python Programming


import re
m = re.search(r"([a-z0-9])\1{1,}", input())
if m:
    print(m.group(1))
else:
    print(-1)
Copy The Code & Try With Live Editor
Advertisements

Demonstration


Previous
[Solved] Re.split() in PYTHON solution in Hackerrank
Next
[Solved] Re.findall() & Re.finditer() in PYTHON solution in Hackerrank