Reference FQL API reference String insert() string.insert() Insert a substring into a String at a specified index. Signature insert(index: Number, other: String) => String Description Inserts a substring into the calling String at a provided zero-based offset index position. Returns a new String. The calling String isn’t changed. Parameters Parameter Type Required Description index Number true Zero-based index position to insert the substring at. insert String true Substring to insert. Return value Type Description String String with the inserted substring. Examples 'foo'.insert(0, 'bar') "barfoo" indexOfRegex() lastIndexOf()