Regex to remove duplicate letters

Question

I have a document in Notepad++ where each line can have any combination of characters. For example:

RRGG
U
XB
UUGG
UG

What I would like, is a regex to remove any duplicate characters. So, given the above, I would be left with:

RG
U
XB
UG
UG

I've tried finding ([a-z]) and replacing with \1 based on something I'd seen online, but I got nothing. I've even tried finding ([a-z])+, but that just got me the last letter on the line(not sure why I thought that would work, other than I'm horrible at regex). I also don't want to get rid of any whitespace, or empty lines. What's the best way to do this?

falsetru · Accepted Answer · 2013-07-26 15:29:50Z

21

Find:

([A-Z])\1+

Replace with:

\1

answered Jul 26, 2013 at 15:29

falsetru

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Comments

scanboostar · Accepted Answer · 2021-03-27 19:08:14Z

0

For me in a dutch text, generated with the duplex switch on:

find

(.){2}

replace

\1

answered Mar 27, 2021 at 19:08

scanboostar

1

2 Comments

Toto Over a year ago

Doesn't work for me, have you tried it?

Karim Bn Abdlaziz Over a year ago

you miss "\1+" after (.){2}

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