[#bsl-basic_string-0ce-replace-05]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0ce.adoc[basic_string<char16_t>]::replace
:relfileprefix: ../../
:mrdocs:

Replace the substring in the range starting at the specified `first` position and ending right before the specified `last` position with the specified initial `numChars` characters in the specified `characterString`. Return a reference providing modifiable access to this string. The behavior is undefined unless `first` and `last` are both within the range `[cbegin() .. cend()]`, `first <= last`, and `characterString` is at least `numChars` long.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf.adoc[basic_string<char16_t>]&
replace(
    xref:bsl/basic_string-0ce/const_iterator.adoc[const_iterator] first,
    xref:bsl/basic_string-0ce/const_iterator.adoc[const_iterator] last,
    char16_t const* characterString,
    xref:bsl/basic_string-0ce/size_type.adoc[size_type] numChars);
----


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