[#bsl-basic_string-01d-find_first_not_of-043]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-01d.adoc[basic_string<char8_t>]::find_first_not_of
:relfileprefix: ../../
:mrdocs:

Return the position of the _first_ occurrence of a character _not_ belonging to the specified `characterString`, if such an occurrence can be found in this string (on or _after_ the optionally specified `position` if such a `position` is specified), 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]
find_first_not_of(
    xref:bsl/basic_string-0faf.adoc[basic_string<char8_t>] const& characterString,
    xref:bsl/basic_string-01d/size_type.adoc[size_type] position = 0) const noexcept;
----


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