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Here's a non-recursive way which I think fits your criteria:

use strict; use warnings; use Test::More; my $wiki = '_/one *two*/ three_ null _/four *five*/ six_ null _/seven *eight +*/ nine_'; my $expected = '<u><i>one <b>two</b></i> three</u> null <u><i>four <b>five</b></i +> six</u> null <u><i>seven <b>eight</b></i> nine</u>'; my %h = ( '*' => 'b' , '/' => 'i' , '_' => 'u' , ); my $DBG = 1; sub flip { my $s = shift; my $z = $h{$s}; $h{$s} = $z =~ /\// ? substr ($z, 1, 1) : "/$z"; return "<$z>"; } sub tf { diag "Pre: '$_'\n\n" if $DBG; s{([_*/])}{flip($1)}eg }; $_ = $wiki; diag "IN <= '$wiki'\n\n" if $DBG; tf(); is ($_, $expected, " repeated replace works"); done_testing;

In reply to Re^2: wiki regex reprocessing replacement by hippo
in thread wiki regex reprocessing replacement by LanX

and:  <code> code here </code>

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