Thanks a lot for the help.
Yes this works , I was trying to do s/(\w)$1+//;
I forgot that $1 is not defined inside a pattern as it is being matched and hence I should be using \1 instead

In reply to Re^2: How to remove all repeating characters in a string in place by punitpawar
in thread How to remove all repeating characters in a string in place by punitpawar

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