Title here
Summary here
Url Parsing in Wolfram Language
Here’s the translation of the URL parsing example from Go to Wolfram Language, formatted in Markdown suitable for Hugo:
URLs provide a uniform way to locate resources. Here’s how to parse URLs in Wolfram Language.
(* We'll parse this example URL, which includes a
scheme, authentication info, host, port, path,
query params, and query fragment. *)
s = "postgres://user:pass@host.com:5432/path?k=v#f";
(* Parse the URL and ensure there are no errors. *)
u = URLParse[s];
(* Accessing the scheme is straightforward. *)
Print[u["Scheme"]]
(* User contains all authentication info; we can extract
username and password individually. *)
Print[u["User"]]
Print[u["User"]["Username"]]
Print[u["User"]["Password"]]
(* The Host contains both the hostname and the port,
if present. We can extract them separately. *)
Print[u["Host"]]
Print[u["Domain"]]
Print[u["Port"]]
(* Here we extract the path and the fragment after the #. *)
Print[u["Path"]]
Print[u["Fragment"]]
(* To get query params in a string of k=v format,
use "Query". You can also parse query params
into an association. *)
Print[u["Query"]]
m = Association[URLParse[s]["Query"]]
Print[m]
Print[m["k"]]Running our URL parsing program shows all the different pieces that we extracted:
postgres
user:pass
user
pass
host.com:5432
host.com
5432
/path
f
k=v
<|"k" -> "v"|>
vIn Wolfram Language, we use the URLParse function to parse URLs. This function returns an association with various components of the URL. We can access these components using string keys.
The Association function is used to convert the query parameters into a key-value store, similar to a map in other languages.
Note that Wolfram Language provides a more integrated approach to URL parsing, with less need for separate functions to split host and port or parse query parameters. The URLParse function handles most of these tasks automatically.