:relfileprefix: ../../../
[#99275BCADCA46A3AEE1D0CB55BC8B2AD66DB3A63]

= Function params_base::find

pass:v,q[Find a matching key]


== Synopsis

Declared in header `</boost/url/params_base.hpp#L341[boost/url/params_base.hpp,window=blank_]>`

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

== Description

pass:v,q[This function examines the parameters] pass:v,q[in the container to find a match for]
pass:v,q[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 from the first param]
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]
----
assert( (*url_view( "?first=John&last=Doe" ).params().find( "First", ignore_case )).value == "John" );
----

=== Effects
[,cpp]
----
return this->find( this->begin(), key, ic );
----

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



== Return Value

* `iterator` 


== Parameters

|===
| Name | Type 

| *key*
| `string_view`

| *ic*
| `ignore_case_param`

|===