[#bsl-basic_string-01d-replace-068]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-01d.adoc[basic_string<char8_t>]::replace
:relfileprefix: ../../
:mrdocs:

Replace the specified `outNumChars` characters starting at the specified `outPosition` in this string (or the suffix of this string starting at `outPosition` if `outPosition + outNumChars > length()`) with the specified `replacement` string, and return a reference providing modifiable access to this string. Throw `out_of_range` if `outPosition > length()`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf.adoc[basic_string<char8_t>]&
replace(
    xref:bsl/basic_string-01d/size_type.adoc[size_type] outPosition,
    xref:bsl/basic_string-01d/size_type.adoc[size_type] outNumChars,
    xref:bsl/basic_string-0faf.adoc[basic_string<char8_t>] const& replacement);
----


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