:relfileprefix: ../../../
[#43F371425D161735CCCEF4662431F9060857A793]

= Function params_base::find

pass:v,q[Find a matching key]


== Synopsis

Declared in header `</boost/url/params_base.hpp#L386[boost/url/params_base.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
find(
    xref:boost/urls/params_base/iterator.adoc[iterator] from,
    string_view key,
    xref:boost/urls/ignore_case_param.adoc[ignore_case_param] ic = = {}) const noexcept;
----

== Description

pass:v,q[This function examines the] pass:v,q[parameters in the container to] pass:v,q[find a match for the specified key.]
pass:v,q[The comparison is performed as if all]
pass:v,q[escaped characters were decoded first.]
pass:v,q[The search starts at `from`]
pass:v,q[and proceeds forward until either the]
pass:v,q[key is found or the end of the range is]
pass:v,q[reached, in which case `end()` is]
pass:v,q[returned.]

=== Example
[,cpp]
----
url_view u( "?First=John&Last=Doe" );

assert( u.params().find( "first" ) != u.params().find( "first", ignore_case ) );
----

=== Complexity
pass:v,q[Linear in `this->buffer().size()`.]



== Return Value

* `iterator` 


== Parameters

|===
| Name | Type 

| *from*
| `iterator`

| *key*
| `string_view`

| *ic*
| `ignore_case_param`

|===