Develop Reference

How to get value from string with lodash?

Suppose I have a url that looks like this:
http://mysite/super/id/800
The 'super/id' part in the URL is fixed.I am trying to create a compact statement to return the 800 value with lodash. What could be a solution for this. I know how to split it up into an array and then get it from there but just looking for a more elegant solution?

Although it's not lodash I would argue that given the 800 portion of the string is certain to be the final part, the following is cleanest.
string.split('/').pop();
It's best (in my opinion) to avoid using frameworks and libraries unless there is a deficit in the language requiring you to do so.

If you want to avoid creating an array, you could try using String#slice and String#lastIndexOf:
var string = 'http://mysite/super/id/800'
console.log(
string.slice(string.lastIndexOf('/') + 1) //=> '800'
)

Try Regular Expressions
Your url seems to be a good candidate.
var url = "http://mysite/super/id/800";
var pattern = /\d+$/;
var match = pattern.exec(url);
// ["800"], it will be null if there was no match

Extracting a specific part of a URL using regex in JavaScript

I'm fairly new to any kind of language but I need to modify a code at my work because the guy doing it previously left and no replacement.
I basically would like to put in a variable a specific part of a url.
The URLs look like this:
http://www.test.com/abc/hhhhhh/a458/example
I need to extract the a458 part and put it in a variable. This part is always at the same place but can be of variable length.
The URLs always have the same structure. I tried /hhhhhh\/{1}[a-z0-9]+\/{1}/g but it doesn't fully work. It keeps the hhh and the /.

no need for regex, just split it
var link = "http://www.test.com/abc/hhhhhh/a458/example";
var linkParts = link.split("/");
//If the link is always in that format then a458 or whatever
//would replace it will be in index 5
console.log(linkParts[5]);

What would be the regex to get the view code from youtube urls?

I just need to get the view code from youtube urls. The api is returning back strings that look like this:
http:\/\/www.youtube.com\/watch?v=XODUrTtvZks&feature=youtube_gdata_player
I need to get this part:
XODUrTtvZks
from the above, keep in mind that sometimes there may be additional parameters after the v=something like:
&feature=youtube_gdata_player
and sometimes there may not be. Can someone please provide the regex that would work in this situation and an example of how to use it using javascript?

You can use /v=([^&]+)/ and get the match at offset 1.

This snippet only matches on URL's from youtube.com:
var url = 'http://www.youtube.com/watch?v=XODUrTtvZks&feature=youtube_gdata_player';
var matches = url.match(/^http[s]?:\/\/www.youtube.com\/watch\?\s*v=([^&]+)/i);
if (matches) {
var videoID = matches[1];
// do stuff
}

You can use an online tool called RegExr to get your regular expression ,[http://gskinner.com/RegExr/].
Regards
Rahul

This snippet is from Google’s own parser at closure:
function getIdFromUrl(url) {
return /https?:\/\/(?:[a-zA_Z]{2,3}.)?(?:youtube\.com\/watch\?)((?:[\w\d\-\_\=]+&(?:amp;)?)*v(?:<[A-Z]+>)?=([0-9a-zA-Z\-\_]+))/i.exec(url)[2];
}
You can see it here:
http://code.google.com/p/closure-library/source/browse/trunk/closure/goog/ui/media/youtube.js?r=1221#246

Javascript - Get query string from a string?

I'm trying to get the query string from a string (not the current URL).
For example, I have a URL 'www.google.com/?query=string', I'd like to be able to run a function on it and get '?query=string' back from it. How would I go about doing this?
Thanks

Well, you can use a quick regexp that gets you the part you need:
myString.match(/(\?.*)/)[1]
Example:
'www.google.com/?query=string'.match(/(\?.*)/)[1] // evaluates to '?query=string'

Window.location.search will evaluate to this.
http://www.w3schools.com/jsref/prop_loc_search.asp

There's a jQuery plugin for that.

If you're using jQuery, use this plugin: http://projects.allmarkedup.com/jquery_url_parser/
This one lets you operate on the document's url, or any URL string
Then you can do:
$.url.setUrl("www.google.com/?query=string").attr("query") // returns 'query=string'
Or also get a specific parameter:
$.url.setUrl("www.google.com/?query=string").param("query") // returns 'string'
But if you really just need the whole query string, a quick regex like Alsciende suggested is the way to go.

get query string into js/jquery

i hae a link like ( domain.com/jsapi?key=123456 )
hov can i get this "key" into my JS code? i use jQuery and i don't know about its are easy way to get this "key" into JS variable.
tanks for all.

This plugin might helps: jquery url parser
key = $.url.setUrl($(yourlink).attr('href')).param('key');
(not tested)

It's not jquery. It's pure javascript. You can use regexp.
str = "domain.com/jsapi?key=123456" # Take it from wherever you want
splitted = str.split(/\?key=([0-9]+)/)
Then you'll have an array in the "splitted" variable, it's second element (at the id 1) containing the value.

jQuery not needed. The query string is available from the DOM:
window.location.search.match(/key=([^&]*)/);
Which gives you an array that has your value in it.

You can use the URL constructor as follows:
let url = new URL('https://example.com/jsapi?key=123456');
console.log(url.searchParams.get('key')); // Outputs 123456
Using this method you can parse and get any part of a URL.
Important:
Note that I've added the protocol (https://) to the sample URL so I make sure it is a valid URL and it can be parsed.
Take into account the browser compatibility. You can check it here
For more details you can also the the specification.