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1. the results for n=0..length and n=100:
<b>'a.b.c.d' '.'</b><br />
pos: 1; (0..7) 1 1 3 3 5 5 -1 -1; (100) -1<br />
rpos: 5; (0..7) -1 1 1 3 3 5 5 5; (100) 5<br />
<b>'abab' 'ab'</b><br />
pos: 0; (0..4) 0 2 2 -1 -1; (100) -1<br />
rpos: 2; (0..4) 0 0 2 2 2; (100) 2<br />
<b>'aaaa' 'aa'</b><br />
pos: 0; (0..4) 0 1 2 -1 -1; (100) -1<br />
rpos: 2; (0..4) 0 1 2 2 2; (100) 2<br />
<b>'abacad' 'ab'</b><br />
pos: 0; (0..6) 0 -1 -1 -1 -1 -1 -1; (100) -1<br />
rpos: 0; (0..6) 0 0 0 0 0 0 0; (100) 0<br />
<b>'abab' 'abab'</b><br />
pos: 0; (0..4) 0 -1 -1 -1 -1; (100) -1<br />
rpos: 0; (0..4) 0 0 0 0 0; (100) 0<br />
<b>'abab' 'ababa'</b><br />
pos: -1; (0..4) -1 -1 -1 -1 -1; (100) -1<br />
rpos: -1; (0..4) -1 -1 -1 -1 -1; (100) -1<br />
<b>'привет, мир, пока' ', '</b><br />
pos: 6; (0..17) 6 6 6 6 6 6 6 11 11 11 11 11 -1 -1 -1 -1 -1 -1; (100) -1<br />
rpos: 11; (0..17) -1 -1 -1 -1 -1 -1 6 6 6 6 6 11 11 11 11 11 11 11; (100) 11<br />
<b>'привет, мир, пока' 'ир'</b><br />
pos: 9; (0..17) 9 9 9 9 9 9 9 9 9 9 -1 -1 -1 -1 -1 -1 -1 -1; (100) -1<br />
rpos: 9; (0..17) -1 -1 -1 -1 -1 -1 -1 -1 -1 9 9 9 9 9 9 9 9 9; (100) 9<br />
<b>'привет, мир, пока' 'я'</b><br />
pos: -1; (0..17) -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1; (100) -1<br />
rpos: -1; (0..17) -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1; (100) -1<br />
<b>'abab' ''</b><br />
pos: -1; (0..4) -1 -1 -1 -1 -1; (100) -1<br />
rpos: -1; (0..4) -1 -1 -1 -1 -1; (100) -1<br />
<b>'' 'a'</b><br />
pos: -1; (0..0) -1; (100) -1<br />
rpos: -1; (0..0) -1; (100) -1<br />
2. the string made of pieces, not of one literal:
<b>'ab..cd.ef' '.'</b><br />
pos: 2; (0..9) 2 2 2 3 6 6 6 -1 -1 -1; (100) -1<br />
rpos: 6; (0..9) -1 -1 2 3 3 3 6 6 6 6; (100) 6<br />
3. wrong parameters:
^s.rpos[.](-1): Exception: n(-1) must be >=0<br />
^s.rpos[.](x): Exception: n must be int (parameter #2)<br />
^s.rpos{.}: Exception: substr must not be code (parameter #1 is 'junction')<br />