get query variable

README.md

use like this:

getQueryVariable("foo")

To get variables in urls eg:

http://foo.com/index.html?foo=bar

If you want to support arrays, check the version by @atk below:

annotated.js

function(a){
	return RegExp("[&?]"+a+"=([^&]+)").exec(location)[1]
}

//searches the url (location)
//finds the text after a "&" or a "?" followed by the variable name, followed by a "="
//and before another "&"

index.js

function(a){return RegExp("[&?]"+a+"=([^&]+)").exec(location)[1]}
//If you want to support arrays (Thanks atk!)
function(a){for(var b=[],c,d=eval('/[&?]'+a+'(\\[])?=([^&]+)/g');c=d.exec(location);)b.push(c[2]);return b}

package.json

{
  "name": "getQueryVariable",

  "description": "Get variables in urls",

  "keywords": [
    "url",
    "query",
    "string",
    "variable",
    "get"
  ]
}

test.html

<script>
getQueryVariable = function(a){return RegExp("[&?]"+a+"=([^&]+)").exec(location)[1]}

document.write(getQueryVariable("foo"))
</script>

Only 1 char longer:
function(a){for(var b=[],c,d=eval('/[&?]'+a+'(\\[])?=([^&]+)/g');c=d.exec(location);)b.push(c[2]);return b}

@atk
Great! it works perfectly! (I think...)
I'll put it in my gist!
Thanks!

If you have an anchor on url like param=value#anchor it returns the value like value#anchor, you just need to add one more byte to the code to works =D

function url(a){for(var b=[],c,d=eval('/[&?]'+a+'([])?=([^&^#]+)/g');c=d.exec(location);)b.push(c[2]);return b}