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Available since: Gideros 2016.06
Class: utf8


Insert a substring to s. If idx is given, insert substring before char at this index, otherwise substring will concat to s. idx can be negative.

(string) = utf8.insert(s,idx,substring)


s: (string)
idx: (number) index where to insert optional
substring: (string) optional

Return values

Returns (string) new string