"thhheeee good boyy" should be "t(hhh)(eeee) g(oo)d bo(yy)"
In that case, maybe you want something like this: 
#!/usr/bin/perl -w
use strict;

while (<DATA>) {
    chomp;
    $_ =~ s/(\w)(\1+)/\($1$2\)/g;
    print "$_\n";
}

__DATA__
thhheeee good boyy
the qqquick brrrowwwn fooox

[download]
Output: 
t(hhh)(eeee) g(oo)d bo(yy)
the (qqq)uick b(rrr)o(www)n f(ooo)x

[download]
Cheers,
Darren :)

In reply to Re^4: doubt in matching by McDarren
in thread doubt in matching by uva

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