[#boost-urls-reserved_chars]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::reserved_chars
:relfileprefix: ../../
:mrdocs:


The reserved character set

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/rfc/reserved_chars.hpp#L39[boost/url/rfc/reserved_chars.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr auto reserved_chars = ~unreserved_chars;
----

== Description



=== Example

Character sets are used with rules and    the functions xref:boost/urls/grammar/find_if.adoc[grammar::find_if] and    xref:boost/urls/grammar/find_if_not.adoc[grammar::find_if_not].

[,cpp]
----
system::result< decode_view > rv = grammar::parse( "Program%20Files", pct_encoded_rule( reserved_chars ) );
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-2.3[2&period;3&period; Unreserved Characters (rfc3986)]



== See Also


xref:boost/urls/grammar/find_if.adoc[grammar&colon;&colon;find&lowbar;if],        xref:boost/urls/grammar/find_if_not.adoc[grammar&colon;&colon;find&lowbar;if&lowbar;not],        xref:boost/urls/grammar/parse-02.adoc[grammar&colon;&colon;parse],        xref:boost/urls/pct_encoded_rule.adoc[pct&lowbar;encoded&lowbar;rule]&period;






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