{{str index/sandbox}} Character not recognized by string_index
{{str index}} Character not recognized by string_index
{{str index/sandbox|abc}} Character not recognized by string_index
{{str index|abc}} Character not recognized by string_index
{{str index/sandbox|abc|2}} b
{{str index|abc|2}} b

{{str index/sandbox|abc|3}} c
{{str index|abc|3}} c
{{str index/sandbox|abc|4}} ((str index)): String is not long enough.
{{str index|abc|4}} ((str index)): String is not long enough.
{{str index/sandbox|abc|5}} ((str index)): String is not long enough.
{{str index|abc|5}} ((str index)): String is not long enough.
{{str index/sandbox|abc|6}} ((str index)): String is not long enough.
{{str index|abc|6}} ((str index)): String is not long enough.

{{str index/sandbox|abc|3}} c
{{str index|abc|3}} c
{{str index/sandbox|abc|4}} ((str index)): String is not long enough.
{{str index|abc|4}} ((str index)): String is not long enough.
{{str index/sandbox|abc|5}} ((str index)): String is not long enough.
{{str index|abc|5}} ((str index)): String is not long enough.
{{str index/sandbox|abc|6}} ((str index)): String is not long enough.
{{str index|abc|6}} ((str index)): String is not long enough.

{{str index/sandbox|abc|0}} Character not recognized by string_index
{{str index|abc|0}} Character not recognized by string_index
{{str index/sandbox|abc|1}} a
{{str index|abc|1}} a
{{str index/sandbox|abc|1}} a
{{str index|abc|1}} a

{{str index/sandbox|abc|0}} Character not recognized by string_index
{{str index|abc|0}} Character not recognized by string_index
{{str index/sandbox|abc|1}} a
{{str index|abc|1}} a
{{str index/sandbox|abc|1}} a
{{str index|abc|1}} a