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Match string using regex

I have the following variable:
var test = category~[330526|330519]^Size{1}~[m]
How do I match just to get category~[330526|330519] using regex.
This value can also change so it could be category~[3303226|333219]

Just try with:
test.split('^')[0];

var test = 'category~[330526|330519]^Size{1}~[m]';
var result = test.split('^').shift();
FIDDLE

You could;
result = test.substr(0, test.indexOf("]") +1);

This should do it:
category~\[\d+\|\d+\]

If you insist on using a Regex, this one doesn't care about what the category is (.*~\[\d+\|\d+\]). Here is a Rubular to prove it. But I have to say, the answer by #hsz is really the most insightful. The split is probably the right tool for the job.

Yet another approach...
var test = 'category~[330526|330519]^Size{1}~[m]';
var result = test.replace(/\^.+/,"");

"category~[330526|330519]^Size{1}~[m]".replace(/(category~[\d+\|\d+]).*/,"$1"), you should get the string, or you can use match as well.

Remove special character (ampersand) from a string with jQuery or javascript

I'm trying to achieve something that 'should' be fairly straightforward, bit I can't find anything online to help me out.
I have some CSS class names that are being output with ampersands in them (its down to the system I'm using and is unavoidable). I'd like to use a little bit of jQuery to simply remove the ampersand, so a string that looks like:
class="Middle&East"
would be
class="MiddleEast"
Any help with this would be very much appreciated.
Thanks

To replace them all you could;
$('[class*=\\&]').each(function() {
$(this)[0].className = $(this)[0].className.replace(/&/g,"");
})
​

Try:
var class="Middle&East"
class.replace('&', '');

You will have to escape the & if you are using jquery
Try
$(".Middle\\&East").removeClass("Middle&East").addClass("MiddleEast");
DEMO
General solution to remove & from classname
$(function(){
$('[class*="&"]').each(function(){
var $this = $(this),cname = $this.attr('class').replace(/&/g,'');
$this.attr('class',cname)
})
})

Maybe something along
$(".Middle&East").removeClass("Middle&East").addClass("MiddleEast");

This one seems to works for me :
$(function() {
$('[class="Middle&East"]').toggleClass('Middle&East MiddleEast');
});
Here's a jsfiddle : http://jsfiddle.net/U3r7G/

var className = $(element).attr('class');
var modifiedClass = className.replace('&', '');
$(element).attr('class', modifiedClass);

jQuery how to insert <br/> tag after every Semicolon

I am dumping some CSS into a div and I am looking to format it so it is more legible. Basically what I want to do is insert a break tag after every semicolon. I have searched around for a while but can't seem to find something that quite fits what I am trying to do.
I have something like this...
HTML
<div class='test'>
color:red;background-color:black;
</div>​
jQuery
var test = $('.test').text();
var result = test.match(/;/g);
alert(result);​
And I have tried..
var test = $('.test').text();
var result = test.match(/;/g);
result.each(function(){
$('<br/>').insertAfter(';');
});
alert(result);​
Also I have started a fiddle here.. Which basically just returns the matched character...
http://jsfiddle.net/krishollenbeck/zW3mj/9/
That is the only part I have been able to get to work so far.
I feel like I am sort of heading down the right path with this but I know it isn't right because it errors out. I am thinking there is a way to insert a break tag after each matched element, but I am not really sure how to get there. Any help is much appreciated. Thanks...

try it like this
var test = $('.test').text();
var result = test.replace(/\;/g,';<br/>');
$('.test').html(result);​
http://jsfiddle.net/Sg5BB/

You can use a normal javascript .replace() method this way:
​$(document)​.ready(function(){
$(".test").html($(".test").html().replace(/;/g, ";<br />"));
});​
Fiddle: http://jsfiddle.net/SPBTp/4/

Use This CODE
var test = $('.test').text();
var result = test.split(';').join(';<br />')
http://jsfiddle.net/FmBpF/

You can't use jQuery selectors on text, it only works on elements.
Get the text, just replace each ; with ;<br/>, and put it back.
$('.test').html($('.test').text().replace(/;/g, ';<br/>'));

Try something like this :
var test = $('.test').text();
var result = test.replace(/;/g,";");
$('.test').html(result);
​
That should work if you stick it into your jfiddle.

remove full path, keep filename only

Trying to remove the full url that is being returned to imgurl:
Usually returns something like http://localhost/wordpress/wp-content/uploads/filename.jpg
or http://localhost/wordpress/wp-content/uploads/images/filename.jpg
I'd like to strip off everything except filename.jpg and return it to
ahng_photos_upload_image. Strip off everything to the last forward-slash.
How can I do that with Jquery?
window.send_to_editor = function(html) {
imgurl = jQuery('img',html).attr('src');
jQuery('#ahng_photos_upload_image').val(imgurl);
tb_remove();
}

You don't need jQuery for that, just plain old JavaScript will do :)
alert('http://localhost/wordpress/wp-content/uploads/filename.jpg'.split('/').pop());​​
In your case:
var filename = imgurl.split('/').pop();

you can use a regular expression in order to achieve this..
var file = imgUrl.replace(/^.*[\\\/]/, '');
Now the file would consist of only the file name ..

If you're pretty confident that the URLs don't have funny stuff like hashes or parameters, a regex like this would do it:
var filename = imgurl.replace(/^.*\/([^/]*)$/, "$1");
Also: don't forget to declare "imgurl" with var, and you should probably use .prop() instead of .attr() if your version of jQuery is 1.6 or newer:
var imgurl = jQuery('img', html).prop('src');
Also jQuery internally turns the two-argument form of the function into this:
var imgurl = jQuery(html).find('img').prop('src');
so you might as well code it that way.

One further option:
var filename = imgurl.substring(imgurl.lastIndexOf('/') + 1);
JS Fiddle demo.

Here you have
var filename = imgurl.split('/').slice(-1);
Good luck!

Try this one:
imgurl.split('/').slice(-1);
Edit: Look at the version of #Andy who uses the pop() method, the latter being faster than slice(-1).

Note that if you don't know if you have forward or backward slashes, you are better off using the RE version of split:
"path".split(/[\/\\]/).slice(-1)

Here is an answer that will work when your file name is like ./file.jpg
var extension = fileName.slice((fileName.lastIndexOf(".") - 1 >>> 0) + 2);
var baseName = fileName.replace(/^.*\/([^/]*)$/, "$1");
var path = fileName.replace(/(^.*\/)([^/]*)$/, "$1");

How to remove " from my Json in javascript?

I am trying to inject json into my backbone.js app. My json has " for every quote.
Is there a way for me to remove this?
I've provided a sample below:
[{"Id":1,"Name":"Name}]

Presumably you have it in a variable and are using JSON.parse(data);. In which case, use:
JSON.parse(data.replace(/"/g,'"'));
You might want to fix your JSON-writing script though, because " is not valid in a JSON object.

Accepted answer is right, however I had a trouble with that.
When I add in my code, checking on debugger, I saw that it changes from
result.replace(/"/g,'"')
to
result.replace(/"/g,'"')
Instead of this I use that:
result.replace(/(&quot\;)/g,"\"")
By this notation it works.

var data = $('<div>').html('[{"Id":1,"Name":"Name}]')[0].textContent;
that should parse all the encoded values you need.

This is a simple way to replace &quot with what you need to change it - chars, strings etc.
function solve(input) {
const replaceWith = '"' // e.g. replace " by "
const result = input.replace(/"/g, replaceWith)
return result;
}
console.log(solve('{"x":"1","y":"2","z":"10"}')

The following works for me:
function decodeHtml(html) {
let areaElement = document.createElement("textarea");
areaElement.innerHTML = html;
return areaElement.value;
}

In my case "quot" was replaced with other characters so I found a stupid but working workaround
str.replace(/&qu/g,'').replace(/ot\;/g,'')

i used replace feature in Notepad++ and replaced " (without quotes) with " and result was valid json

IF you are using SQL then you can use:
update tablename
set payload = replace(payload, '&', chr(39))
where id = 'unique id';

If you are using python then you can use:
import html
l = [{"Id":1,"Name":"Name}]
r = html.unescape(l)