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I agree it does but it also captures thing I wouldn't want to catch like - GGGGG

Try running -
echo 'GGGGGGGG' | egrep '(.)([^\1]\2\1'

And you'll get GGGGGG echoed on the screen.

I...

Hey!

Thanks for the fast reply !

But the RegExp you wrote will accept strings of the form 'xxxx' and 'yyyy'.
I'm looking for a pattern that maches on 'xyyx' (Where x is different character...

Hello,

I was trying to identify lines who has a word of the following pattern "xyyx" (where x, and ys are different characters).

I was trying the following grep -
egrep '(\S)([^\1])\2\1'
...