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

Match a non‐empty string of characters from a set

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/token_rule.hpp#L79[boost/url/grammar/token_rule.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:boost/urls/grammar/CharSet.adoc[CharSet] CS>
constexpr
/* implementation-defined */
token_rule(CS const& cs) noexcept;
----

== Description

If there is no more input, the error code xref:boost/urls/grammar/error.adoc[`error::need_more`] is returned.

== Value Type
[,cpp]
----
using value_type = core::string_view;
----
== Example
Rules are used with the function xref:boost/urls/grammar/parse-09.adoc[`parse`].

[,cpp]
----
system::result< core::string_view > rv = parse( "abcdef", token_rule( alpha_chars ) );
----
== BNF
[,cpp]
----
token     = 1*( ch )
----
== Return Value

The token rule

== Parameters

[cols=2]
|===
| Name
| Description
| *cs*
| The character set to use
|===

== See Also

xref:boost/urls/grammar/alpha_chars.adoc[`alpha&lowbar;chars`], xref:boost/urls/grammar/parse-09.adoc[`parse`]&period;


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