Insert at the specified position in this string the specified initial numChars characters in the specified characterString, and return a reference providing modifiable access to this string. Throw out_of_range if position > length(). The behavior is undefined unless characterString is at least numChars long.
Synopsis
Declared in <bslstl_string.h>
basic_string<char8_t>&
insert(
size_type position,
char8_t const* characterString,
size_type numChars);
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