[#bsl-basic_string-0ce-rfind-02]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0ce.adoc[basic_string<char16_t>]::rfind
:relfileprefix: ../../
:mrdocs:

Return the starting position of the _last_ occurrence of a substring whose value equals that of the specified `characterString` of the optionally specified `numChars` length, if such a substring can be found in this string (on or _before_ the optionally specified `position` if such a `position` is specified), and return `npos` otherwise. If `numChars` is not specified, `CHAR_TRAITS::length(characterString)` is used.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0ce/size_type.adoc[size_type]
rfind(
    char16_t const* characterString,
    xref:bsl/basic_string-0ce/size_type.adoc[size_type] position,
    xref:bsl/basic_string-0ce/size_type.adoc[size_type] numChars) const;
----


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