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

Return the known scheme for a non‐normalized string, if known

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/scheme.hpp#L141[boost/url/scheme.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/scheme.adoc[scheme]
string_to_scheme(core::string_view s) noexcept;
----

== Description

If the string does not identify a known scheme, the value xref:boost/urls/scheme.adoc[`scheme::unknown`] is returned.

== BNF
[,cpp]
----
scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
----
== Specification
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.1[]

== Return Value

The known scheme

== Parameters

[cols=2]
|===
| Name
| Description
| *s*
| The string holding the scheme
|===


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