regex substitution - Regular Expressions - HackerRank - #13 - Python Practice Examples

Published: 09 May 2020
on channel: Interview Coder

468

This Challange is to test the logic of regex substitution in HackerRank.

Join :
/ jagwithyou
/ jagwithyou
https://github.com/jagwithyou

Hint:
The re.sub() tool (sub stands for substitution) evaluates a pattern and, for each valid match, it calls a method (or lambda).
The method is called for all matches and can be used to modify strings in different ways.
The re.sub() method returns the modified string as an output.

Learn more about .

Transformation of Strings

Code

import re

#Squaring numbers
def square(match):
number = int(match.group(0))
return str(number**2)

print re.sub(r"\d+", square, "1 2 3 4 5 6 7 8 9")
Output

1 4 9 16 25 36 49 64 81

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