[#BloombergLP-bdlb-CharType-isAlnum]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/CharType.adoc[CharType]::isAlnum
:relfileprefix: ../../../
:mrdocs:

Return `true` if the specified `character` is in the `ALNUM` category (i&period;e&period;, `&lsqb;0&hyphen;9A&hyphen;Za&hyphen;Z&rsqb;`), and `false` otherwise&period;

== Synopsis

Declared in `&lt;bdlb&lowbar;chartype&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
isAlnum(char character);
----


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