seems like homejob, because it's useless but tuitfull. Anyway (on Win32 shell): 
perl -wne "s/(.)\1+(?!\1)/length($&)>2?qq[$&]:qq[($1$1)]/ge;print" fil
+e.txt

[download]
on Unix just 
perl -wne 's/(.)\1+(?!\1)/length($&)>2?qq[$&]:qq[($1$1)]/ge;print' fil
+e.txt

[download]
Got same result on your input!

Courage, the Cowardly Dog.

In reply to Re: How to do it in one line? by Courage
in thread How to do it in one line? by r

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