:relfileprefix: ../../../
[#boost-urls-grammar-alnum_chars]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/grammar.adoc[pass:[grammar]]::alnum_chars



== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/alnum_chars.hpp#L86[boost/url/grammar/alnum_chars.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
xref:boost/urls/grammar/alnum_chars_t.adoc[alnum_chars_t] const alnum_chars = {};
----