You can use `\D` which means *non digits*.

    var removedText = self.val().replace(/\D+/g, &#39;&#39;);

[jsFiddle][1].

You could also use the [HTML5 *number* input][2].

    &lt;input type=&quot;number&quot; name=&quot;digit&quot; /&gt;

[jsFiddle][3].


  [1]: http://jsfiddle.net/alexdickson/ZxtXb/
  [2]: http://www.w3.org/TR/html-markup/input.number.html
  [3]: http://jsfiddle.net/alexdickson/v9g5e/

Simple:

    var removedText = self.val().replace(/[^0-9]+/, &#39;&#39;);

^ - means NOT

Try the following regex:

    var removedText = self.val().replace(/[^0-9]/, &#39;&#39;);

This will match every character that is **not** (`^`) in the interval 0-9.

[Demo][1].


  [1]: http://jsfiddle.net/4vuHN/2/

If you want to keep only numbers then use `/[^0-9]+/` instead of `/[^a-zA-Z]+/`

I want to get the output from some shell commands like `ls` or `df` in a python script. I see that `commands.getoutput(&#39;ls&#39;)` is deprecated but `subprocess.call(&#39;ls&#39;)` will only get me the return code.

I&#39;ll hope there is some simple solution.

python getoutput() equivalent in subprocess

How do I parse an URL with JavaScript (also with jQuery)?

For instance I have this in my string,

    url = &quot;http://example.com/form_image_edit.php?img_id=33&quot;

I want to get the value of `img_id`

I know I can do this easily with PHP with `parse_url()`, but I want to know how it is possible with JavaScript.

Parse an URL in JavaScript

How can you remove letters, symbols such as `∞&#167;&#182;•&#170;&#186;&#186;&#171;≥≤&#247;` but leaving plain numbers 0-9, I want to be able to not allow letters or certain symbols in an input field but to leave numbers only.

[Demo][1].

If you put any symbols like `&#161; € # &#162; ∞ &#167; &#182; • &#170;` or else, it still does not remove it from the input field. How do you remove symbols too? The `\w` modifier does not work either.


  [1]: http://jsfiddle.net/4vuHN/

Regex to remove letters, symbols except numbers

How can you remove letters, symbols such as <code>∞§¶•ªºº«≥≤÷</code> but leaving plain numbers 0-9, I want to be able to not allow letters or certain symbols in an input field but to leave numbers only.
<a href="http://jsfiddle.net/4vuHN/" target="_blank" rel="noopener noreferrer">Demo</a>.
If you put any symbols like <code>¡ € # ¢ ∞ § ¶ • ª</code> or else, it still does not remove it from the input field. How do you remove symbols too? The <code>\w</code> modifier does not work either.

I read somewhere that setInterval is CPU intensive. I created a script that uses setInterval and monitored the CPU usage but didn&#39;t notice a change. I want to know if there is something I missed.

What the code does is check for changes to the hash in the URL (content after #) every 100 milliseconds and if it has changed, load a page using AJAX. If it has not changed, nothing happens. Would there be any CPU issues with that.

Is setInterval CPU intensive?

I am looking for a jQuery function that will clear all the fields of a form after having submitted the form.

I do not have any HTML code to show, I need something generic.

Can you help?

Thanks!

jQuery/Javascript function to clear all the fields of a form

When I discovered that **Node.js was built using the V8 JavaScript engine**, I thought: 

&gt; Great, web scraping will be easier as the page 
  will be rendered like in the browser, with a 
  &quot;native&quot; DOM supporting XPath and any AJAX calls on 
  the page executed.

1. Why doesn&#39;t it have a native DOM when it uses the same JavaScript engine as Chrome?
2. Why doesn&#39;t it have a mode to run JavaScript in retrieved pages?
3. What am I not understanding about JavaScript engines vs the engine in a web browser?

Many thanks!

Why doesn&#39;t Node.js have a native DOM?

Within JSP files, I have some pretty complicated Javascript.  On a production machine, we&#39;re seeing a very weird bug that we have not been able to understand.  We have never been able to replicate it in a local or development environment.  It might be related to the javascript, but I haven&#39;t found a good way to do this: use my browser to visit the page (on the production website) and then use browser tools to edit the javascript that runs on that page, including on reloads of the page.

I&#39;m always able to do this to tweak CSS etc, but as these questions point out, it&#39;s not obvious how to tweak JS client-side:

 - https://stackoverflow.com/questions/3701225/best-way-to-capture-javascript-errors-in-production
 - https://stackoverflow.com/questions/2558346/how-to-edit-javascript-in-browser
 - https://stackoverflow.com/questions/3203779/how-to-edit-javascript-in-firebug-in-mozilla
 - https://stackoverflow.com/questions/2725669/how-can-i-edit-a-js-file-sent-by-the-server-before-it-gets-to-my-browser
 - https://stackoverflow.com/questions/3936490/how-to-replace-javascript-of-production-website-with-local-javascript
 - https://stackoverflow.com/questions/5082844/with-firefox-w-firebug-how-can-i-write-javascript-in-the-browser-and-use-the-js

However, those answers don&#39;t help me because:

 - &quot;Execute JS&quot; (Firefox addon) doesn&#39;t seem to work (doesn&#39;t do more than the console in Chrome already can do), 
 - &quot;Charles&quot; might work if I&#39;d used separated js files, but my javascript is embedded in JSP

It seems like https://stackoverflow.com/questions/5191284/how-to-modify-javascript-code-on-the-fly-in-browser-in-debugging-mode/5281401#5281401 is the closest thing to what I&#39;m talking about, but that guy isn&#39;t able to talk about what he did because it was for his employer.

Thanks for your help!
Ryan

How can I edit javascript in my browser like I can use Firebug to edit CSS/HTML?

I have a form with a couple of buttons and I&#39;m using jQuery Validation Plugin from http://jquery.bassistance.de/validate/. I just want to know if there is any way I can check if the form is considered in valid state by jquery validation plugin from anywhere in my javascript code.

how to check if a form is valid programmatically using jQuery Validation Plugin

I want to strip script tags out of this HTML at Pastebin:

&gt; http://pastebin.com/mdxygM0a  

I tried using the below regular expression:

    html.replace(/&lt;script.*&gt;.*&lt;\/script&gt;/ims, &quot; &quot;)

But it does not remove all of the script tags in the HTML. It only removes in-line scripts. I&#39;m looking for some regex that can remove all of the script tags (in-line and multi-line). It would be highly appreciated if a test is carried out on my sample http://pastebin.com/mdxygM0a

Removing all script tags from html with JS Regular Expression

With regex (i assume) or some other method, how can i convert things like:

`marker-image` or `my-example-setting` to `markerImage` or `myExampleSetting`.

I was thinking about just splitting by `-` then convert the index of that hypen +1 to uppercase. But it seems pretty dirty and was hoping for some help with regex that could make the code cleaner.

_No_ jQuery...

Convert hyphens to camel case (camelCase)

I am reading a book on regular expression and I came across this example for `\b`:

&gt;The cat scattered his food all over the room.

Using regex - `\bcat\b` will match the word `cat` but not the `cat` in `scattered`.

For `\B` the author uses the following example:

&gt;Please enter the nine-digit id as it
&gt;
&gt;appears on your color - coded pass-key.

Using regex `\B-\B` matches `-` between the word `color - coded`. Using `\b-\b` on the other hand matches the `-` in `nine-digit` and `pass-key`. 

How come in the first example we use `\b` to separate `cat` and in the second use `\B` to separate `-`? Using `\b` in the second example does the opposite of what it did earlier. 

Please explain the difference to me.

EDIT: Also, can anyone please explain with a new example?










Difference between \b and \B in regex

Suppose I want to change `the blue dog and blue cat wore blue hats` to `the gray dog and gray cat wore blue hats`.

With `sed` I could accomplish this as follows:

    $ echo &#39;the blue dog and blue cat wore blue hats&#39; | sed &#39;s/blue $dog\|cat$/gray \1/g&#39;

How can I do a similar replacement in Python? I&#39;ve tried:

    &gt;&gt;&gt; import re
    &gt;&gt;&gt; s = &quot;the blue dog and blue cat wore blue hats&quot;
    &gt;&gt;&gt; p = re.compile(r&quot;blue (dog|cat)&quot;)
    &gt;&gt;&gt; p.sub(&#39;gray \1&#39;,s)
    &#39;the gray \x01 and gray \x01 wore blue hats&#39;




How to use python regex to replace using captured group?

How do I make an expression to match absolutely anything (including whitespaces)? &lt;br /&gt;Example:

**Regex:**   I bought _____ sheep.

**Matches:** I bought sheep. I bought a sheep. I bought five sheep.

I tried using `(.*)`, but that doesn&#39;t seem to be working.

Regular Expressions- Match Anything

One of the most important rules and best practices when writing a library, is putting all symbols of the
library into a library specific namespace. C++ makes this easy, due to the `namespace` keyword. In
C the usual approach is to prefix the identifiers with some library specific prefix.

Rules of the C standard put some constraints on those (for safe compilation): A C compiler may look at only the first
8 characters of an identifier, so `foobar2k_eggs` and `foobar2k_spam` may be interpreted as the same
identifiers validly – however every modern compiler allows for arbitrary long identifiers, so in our times
(the 21st century) we should not have to bother about this.

But what if you&#39;re facing some libraries of which you cannot change the symbol names / idenfiers? Maybe you got
only a static binary and the headers or don&#39;t want to, or are not allowed to adjust and recompile yourself.


How to deal with symbol collisions between statically linked libraries?

I am loading a YAML file in Rails 3.0.9 like this:

    APP_CONFIG = YAML.load(File.read(File.expand_path(&#39;../app.yml&#39;, __FILE__)))

It loads the all of the contents like hierarchical hashes, no problem.  The part I don&#39;t like is the fact that the hashes can only be accessed with single or double quotes but not a symbol.  

    APP_CONFIG[&#39;mailer&#39;][&#39;username&#39;]  # works fine
    APP_CONFIG[:mailer][:username]    # doesn&#39;t

Any thoughts?

Rails load YAML to hash and reference by symbol

A lot of times people use symbols as keys in a Ruby hash.

What&#39;s the advantage over using a string?

E.g.:

    hash[:name]

vs.

    hash[&#39;name&#39;]

Why use symbols as hash keys in Ruby?

I like this literal expression for an array of strings:

    %w( i can easily create arrays of words )

I am wondering if there is a literal to get an array of symbols. I know I can do 

    %w( it is less elegant to create arrays of symbols ).map( &amp;:to_sym )

but it would be so wonderful just to use a literal.

Is there a literal notation for an array of symbols?

What does `::=` mean in programming documentation?
&lt;br /&gt;For example in the [Lua documentation][1]: or in [Python documentation][2].


  [1]: http://www.lua.org/manual/5.2/manual.html#3.2
  [2]: http://docs.python.org/release/2.7.1/reference/lexical_analysis.html#identifiers

Content Type	Original Author	Original Content on Stackoverflow
Question	MacMac	View Question on Stackoverflow
Solution 1 - Javascript	alex	View Answer on Stackoverflow
Solution 2 - Javascript	Klemen Tusar	View Answer on Stackoverflow
Solution 3 - Javascript	bezmax	View Answer on Stackoverflow
Solution 4 - Javascript	Darin Dimitrov	View Answer on Stackoverflow
Solution 5 - Javascript	Aziz Shaikh	View Answer on Stackoverflow

Regex to remove letters, symbols except numbers

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Parse an URL in JavaScript

python getoutput() equivalent in subprocess

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