Some alternatives:

≥ 5.10 

$lala =~ s/([a-z])\K\1//g;

[download]

See the perlre for 5.10 (or the one for 5.9.5).

< 5.10 

use Regexp::Keep;
$lala =~ s/([a-z])\K\1//g;

[download]

See Regexp::Keep.

Update: Added links to documentation as privately requested.

In reply to Re: perl regex referencing by ikegami
in thread perl regex referencing by ocs

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