Returns 0-based index of token

[Gintaras]

if(empty(s1)) ret -1
can be removed because gett returns -1 when there are no more tokens

Code:

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function# $s $target

for int'i 0 1000000000
,if(_s.gett(s -i)<0) ret -1;; Not found
,if(_s=target) ret i;; 0-based index of token

With ARRAY also OK.