22.10 SubstitutedWord

SubstitutedWord( w, from, to, by )

SubstitutedWord returns a new word where the subword of the word w that begins at position from and ends at position to is replaced by the word by. from and to must be positive integers. Indexing is done with origin 1.

In other words SubstitutedWord(w,from,to,by) is the word Subword(w,1,from-1) * by * Subword(w,to+1,LengthWord(w) (see Subword).

    gap> a := AbstractGenerator("a");;
    gap> b := AbstractGenerator("b");;
    gap> w := (a^2*b)^5*b^-1;
    a^2*b*a^2*b*a^2*b*a^2*b*a^2
    gap> SubstitutedWord(w,5,8,b^-1);
    a^2*b*a^3*b*a^2 

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