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

The set of visible characters

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/vchars.hpp#L76[boost&sol;url&sol;grammar&sol;vchars&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr &sol;&ast; implementation-defined &ast;&sol; vchars = &lcub;&rcub;;
----

== Example

Character sets are used with rules and the functions xref:boost/urls/grammar/find_if.adoc[`find&lowbar;if`] and xref:boost/urls/grammar/find_if_not.adoc[`find&lowbar;if&lowbar;not`]&period;

[,cpp]
----
system::result< core::string_view > rv = parse( "JohnDoe", token_rule( vchars ) );
----
== BNF

[,cpp]
----
VCHAR       = 0x21-0x7E
            ; visible (printing) characters
----
== Specification

* https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1[B&period;1&period; Core Rules (rfc5234)]

== See Also

xref:boost/urls/grammar/find_if.adoc[`find&lowbar;if`], xref:boost/urls/grammar/find_if_not.adoc[`find&lowbar;if&lowbar;not`], xref:boost/urls/grammar/parse-09.adoc[`parse`], xref:boost/urls/grammar/token_rule.adoc[`token&lowbar;rule`]&period;


[.small]#Created with https://www.mrdocs.com[MrDocs]#
