HackerRank Python - Group(), Groups() & Groupdict()




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

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

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



  1. # Enter your code here. Read input from STDIN. Print output to STDOUT
  2. import re
  3. m = re.search(r'([a-zA-Z0-9])\1', input().strip())
  4. print(m.group(1) if m else -1)
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