[#bsl-basic_string-01d-rfind-0f]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-01d.adoc[basic_string<char8_t>]::rfind
:relfileprefix: ../../
:mrdocs:

Return the starting position of the _last_ occurrence of the specified `substring` within this string, if such a sequence can be found in this string (on or _before_ the optionally specified `position` if such a `position` is specified) using `CHAR_TRAITS::eq` to compare characters, and return `npos` otherwise.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-01d/size_type.adoc[size_type]
rfind(
    xref:bsl/basic_string-0faf.adoc[basic_string<char8_t>] const& substring,
    xref:bsl/basic_string-01d/size_type.adoc[size_type] position = npos) const noexcept;
----


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