[#bsl-basic_string-0faf-find_first_not_of-086]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::find_first_not_of
:relfileprefix: ../../
:mrdocs:

Find the first character not in `characterString`.

== Synopsis

Declared in `<bslstl_string.h>`

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

== Description

Return the position of the first character in this string that is not found in the specified `characterString`, or `npos` if not found.

== Return Value

index of the first matching character, or `npos` if none

== Parameters

[cols="1,4"]
|===
| Name| Description
| *characterString*
| null‐terminated set of characters to exclude
| *position*
| index at which to begin the search
|===


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