How to match these words in regex?

Question

I want to match all these using 1 single regex code. https://regex.alf.nu/4 I wrote this ([a-z]{2})(\w+)?\1 but its not working

anallagmatic
bassarisk
abba
chorioallantois
coccomyces
commotive
engrammatic
glossoscopia
hexacoralla
hippogriffin
inflammableness
otto
overattached
saffarid
sarraceniaceae
scillipicrin
tlapallan
trillion
unclassably
unfitting
unsmelled
warrandice

I want to write small code not in or format first string or 2nd or 3rd — Rahul Saxena, Aug 03 '15 at 16:23
The only common part I see here is that there is at least a pair of the same letter. — Banex, Aug 03 '15 at 16:27
This question is not a duplicate, Dont know why people are marking it as duplicate :( — Rahul Saxena, Aug 03 '15 at 16:47
@andrahul ya, at first I don't see anything other than "I want to match all with a single regex". SO always try to show your attempts at very first. — Avinash Raj, Aug 03 '15 at 17:17

Adam Katz · Accepted Answer · 2015-08-03T18:36:53.240

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This looks like the opposite of the regex golf question you linked. The shortest answer I can come up with to match all of those words (and none of the other set of words) is:

(.)(.)\2\1

edited Aug 03 '15 at 18:36

answered Aug 03 '15 at 18:12

Adam Katz

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score 0 · Answer 2 · answered Aug 03 '15 at 20:06

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Try this:

\b\w*(.)(.)\2\1\w*\b

Demo

answered Aug 03 '15 at 20:06

walid toumi

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How to match these words in regex?

2 Answers2