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  1. or download this
    % perl -le 'print"@{[split//,join q(x),split/(?<=c)/,join(q(),qw(a b c
+ d c e foo f)),2]}"'
a b c x d c e f o o f
  2. or download this
    % perl -le 'print"@{[split//,join q(x),split/(?<=c)/,join(q(),qw(a b c
+ d c e),q( ),q(f)),2]}"'
a b c x d c e   f
  3. or download this
    perl -le 'print"@{[split/\0/,join qq(\0x),split/(?<=c)/,join(qq(0),qw(
+a b c d c e foo f)),2]}"'
a b c x d c e foo f