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

Created by Cody Team

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{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Given the string s1, return the string s2 with the target characters removed.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example, given</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ s1 = 'the main event']]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>your code would return</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ s2 = 'the  event']]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Note the 2 spaces between \"main\" and \"event\" Only the four letters in the word \"main\" were deleted.</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

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5396 Solutions
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Last Solution submitted on Sep 15, 2020

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6 Comments

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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

Pascal Wenger 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

Solution Comments

Solution 2055839

1 Comment

1 Comment

Stone Liu on 12 Dec 2019

I think i should learn regular expression

Solution 1848640

1 Comment

1 Comment

Sanzhar Askaruly on 18 Jun 2019

wow

Solution 1840607

1 Comment

1 Comment

Mariana on 6 Jun 2019

Hi all, I just can't find out why the assertion fails. All works well on my MALTAB but not here. Both codes (commented and not) remove only the words which end with 'ain' and leave the two spaces but still the assertions here has failed.

Solution 1311830

3 Comments

3 Comments

Eric Miller on 24 Oct 2017

This passes in R2017b, yet fails here. Why?

David Verrelli on 6 Nov 2017

Actually this code won't pass the Test Suite on any version of MATLAB. The misunderstanding is caused by rendering of HTML text on Cody, which means that double-spaces are not _displayed_ in the Test Suite's solutions; nevertheless, the correct solutions do contain double spaces, as you can confirm by viewing the HTML source, and as also explained in the problem statement. Your code is removing some spaces. I'm sure you can fix it now, with this knowledge.

Eric Miller on 6 Nov 2017

Thanks for clarifying. I appreciate it.

Solution 1220051

1 Comment

1 Comment

Pavol on 26 Jun 2017

Probably not what i was supposed to do, but hey it works.

Solution 1219044

1 Comment

1 Comment

Andrew Dobrovolc on 23 Jun 2017

I think something is broken, I passed it the s2 given in the test suite and the assertion still fails.

Solution 1021589

1 Comment

1 Comment

yao gang on 18 Oct 2016

Took me nearly one hour to solve (though not complete,for just "ain,it is wrong).But I think it's great.I recently learn regular expressions.

Solution 489700

2 Comments

2 Comments

Harish Maradana on 23 Aug 2014

regexprep(s1, '(\w*)ain', '')
not working pls help me

Diwakar on 23 Jul 2018

Hi harish, so the if you see the regexprep documentation, it will tell you when you execute, it will remove every word which contains the letters ain in the expression. You can verify this on your system. To solve this, you need to look for a way to use regexprep such that it only looks for the letters in the end of the word.

Solution 171524

1 Comment

1 Comment

Mehmet OZC on 2 Dec 2012

I have to admit that this solution is not general

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

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

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