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>perl -wMstrict -le
"sub substr_offsets {
...
string: 'An[115]n[115]n[115]';  offsets: (1 2 3)
string: 'n[115]n[115]n[115]A';  offsets: (0 1 2)
string: '01234n[115]012345n[115]n[115]';  offsets: (5 12 13)