    @is_subsequence(s1:string, s2:string)
    @is_subsequence(s1:string, s2:string, cmp:fct)
    @is_subsequence(t1:tab, t2:tab)
    @is_subsequence(t1:tab, t2:tab, cmp:fct)

@is_subsequence is an overloaded function. See also the functions @is_suffix and @is_prefix.

    @is_subsequence(s1:string, s2:string)

the function returns the index of the first occurrence of string `s1` in string `s2`. A negative value is returned if `s1` does not occurs in `s2`.

    @is_subsequence(s1:string, s2:string, cmp:fct)

same as above but the argument `cmp` is used to compare the characters of the strings (represented as strings of only one element).

    @is_subsequence(t1:tab, t2:tab)

the predicate returns the index of the first occurrence of the elements of `t1` as a sub-sequence of the elements of `t2`. A negative value is returned if `t2` does not appear as a subsequence of tab `t2`. For example

                  @is_subsequence([], [1, 2, 3]) -> 0
           @is_subsequence([1, 2, 3], [1, 2, 3]) -> 0
                 @is_subsequence([1], [1, 2, 3]) -> 0
                 @is_subsequence([2], [1, 2, 3]) -> 1
                 @is_subsequence([3], [1, 2, 3]) -> 2
           @is_subsequence([1, 2], [0, 1, 2, 3]) -> 1

    @is_subsequence(t1:tab, t2:tab, cmp:fct)

same as the version above but the function `cmp` is used to compare the elements of the tabs.

See also predicates: @!=, @&&, @||, @<=, @<, @==, @>=, @>, @approx, @arch_darwin, @arch_linux, @arch_windows, @between, @empty, @find, @is_bool, @is_defined, @is_exec, @is_fct, @is_float, @is_function, @is_int, @is_integer_indexed, @is_list, @is_map, @is_nim, @is_numeric, @is_obj, @is_obj_xxx, @is_prefix, @is_string, @is_subsequence, @is_suffix, @is_symbol, @is_undef, @is_vector, @member, @occurs

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