Problem 31. Remove all the words that end with "ain"

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Given the string s1, return the string s2 with the target characters removed.

For example, given

 s1 = 'the main event'

your code would return

 s2 = 'the  event'

Note the 2 spaces between "main" and "event" Only the four letters in the word "main" were deleted.

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Last Solution submitted on Apr 03, 2026

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Aurelien Queffurust on 24 Feb 2012

This problem is fantastic to improve his knowledge with regular expressions!

Aditya Jain on 18 Oct 2016

I have rescored the leading problem to make sure its not zero

Dude on 26 Feb 2017

I learned so much about the regexp and strjoin functions because of this problem. Thank you!

shahriar memaran on 15 Mar 2017

I agree... This problem improved my knowledge of regexp. Although my code is running well in my computer but not here. I'm using R2015a. Can anyone please help ! Thank you

Sanzhar Askaruly on 18 Jun 2019

Did it in two steps, so many functionality in regexp that I discovered for myself today.. )

Asif Newaz on 28 Oct 2019

nice problem..really nic

CJ on 25 Nov 2025

Interesting problem.

Pierre on 15 Dec 2025

pretty tricky

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