Could you explain the purpose?

Anyway here&#39;s one assuming you support few image types.

    (/\.(gif|jpe?g|tiff?|png|webp|bmp)$/i).test(filename)

I have put the whole regular expression within parentheses () so as to disambiguate between the slash (/) operator and RegExp object.  See JSLint for more details.

Here&#39;s the raw regex as well.

    /\.(gif|jpe?g|tiff?|png|webp|bmp)$/i

This Regex also assumes that you&#39;re including the dot before the extension. Remove the `\.` if you&#39;re not.

How do I count columns of a table

I have a method that performs some task with a timeout. I use the ExecutorServer.submit() to get a Future object, and then I call future.get() with a timeout. This is working fine, but my question is the best way to handle checked exceptions that can be thrown by my task. The following code works, and preserves the checked exceptions, but it seems extremely clumsy and prone to break if the list of checked exceptions in the method signature changes.

Any suggestions on how to fix this? I need to target Java 5, but I&#39;d also be curious to know if there are good solutions in newer versions of Java.

	public static byte[] doSomethingWithTimeout( int timeout ) throws ProcessExecutionException, InterruptedException, IOException, TimeoutException {

		Callable&lt;byte[]&gt; callable = new Callable&lt;byte[]&gt;() {
			public byte[] call() throws IOException, InterruptedException, ProcessExecutionException {
				//Do some work that could throw one of these exceptions
				return null;
			}
		};

		try {
			ExecutorService service = Executors.newSingleThreadExecutor();
			try {
				Future&lt;byte[]&gt; future = service.submit( callable );
				return future.get( timeout, TimeUnit.MILLISECONDS );
			} finally {
				service.shutdown();
			}
		} catch( Throwable t ) { //Exception handling of nested exceptions is painfully clumsy in Java
			if( t instanceof ExecutionException ) {
				t = t.getCause();
			}
			if( t instanceof ProcessExecutionException ) {
				throw (ProcessExecutionException)t;
			} else if( t instanceof InterruptedException ) {
				throw (InterruptedException)t;
			} else if( t instanceof IOException ) {
				throw (IOException)t;
			} else if( t instanceof TimeoutException ) {
				throw (TimeoutException)t;
			} else if( t instanceof Error ) {
				throw (Error)t;
			} else if( t instanceof RuntimeException) {
				throw (RuntimeException)t;
			} else {
				throw new RuntimeException( t );
			}
		}
	}

=== UPDATE ===

Many people posted responses that recommended either 1) re-throwing as a general exception, or 2) re-throw as an unchecked exception. I don&#39;t want to do either of these, because these exception types (ProcessExecutionException, InterruptedException, IOException, TimeoutException) are important - they will each be handled differently by the calling processed. If I were not needing a timeout feature, then I would want my method to throw these 4 specific exception types (well, except for TimeoutException). I don&#39;t think that adding a timeout feature should change my method signature to throw a generic Exception type.

What is the best way to handle an ExecutionException?

I need a regular expression to validate image file extensions in javascript. Do you have one ?

Regex JavaScript image file extension

<p>I need a regular expression to validate image file extensions in javascript. Do you have one ?</p>


I am looking for a JavaScript function that can compare two strings and return the likeliness that they are alike. I have looked at soundex but that&#39;s not really great for multi-word strings or non-names. I am looking for a function like:
```js
    function compare(strA,strB){
    
    }
    
    compare(&quot;Apples&quot;,&quot;apple&quot;) = Some X Percentage.
```
The function would work with all types of strings, including numbers, multi-word values, and names. Perhaps there&#39;s a simple algorithm I could use?

Ultimately none of these served my purpose so I used this:
```js
     function compare(c, u) {
            var incept = false;
            var ca = c.split(&quot;,&quot;);
            u = clean(u);
            //ca = correct answer array (Collection of all correct answer)
            //caa = a single correct answer word array (collection of words of a single correct answer)
            //u = array of user answer words cleaned using custom clean function
            for (var z = 0; z &lt; ca.length; z++) {
                caa = $.trim(ca[z]).split(&quot; &quot;);
                var pc = 0;
                for (var x = 0; x &lt; caa.length; x++) {
                    for (var y = 0; y &lt; u.length; y++) {
                        if (soundex(u[y]) != null &amp;&amp; soundex(caa[x]) != null) {
                            if (soundex(u[y]) == soundex(caa[x])) {
                                pc = pc + 1;
                            }
                        }
                        else {
                            if (u[y].indexOf(caa[x]) &gt; -1) {
                                pc = pc + 1;
                            }
                        }
                    }
                }
                if ((pc / caa.length) &gt; 0.5) {
                    return true;
                }
            }
            return false;
        }
        
        // create object listing the SOUNDEX values for each letter
        // -1 indicates that the letter is not coded, but is used for coding
        //  0 indicates that the letter is omitted for modern census archives
        //                              but acts like -1 for older census archives
        //  1 is for BFPV
        //  2 is for CGJKQSXZ
        //  3 is for DT
        //  4 is for L
        //  5 is for MN my home state
        //  6 is for R
        function makesoundex() {
            this.a = -1
            this.b = 1
            this.c = 2
            this.d = 3
            this.e = -1
            this.f = 1
            this.g = 2
            this.h = 0
            this.i = -1
            this.j = 2
            this.k = 2
            this.l = 4
            this.m = 5
            this.n = 5
            this.o = -1
            this.p = 1
            this.q = 2
            this.r = 6
            this.s = 2
            this.t = 3
            this.u = -1
            this.v = 1
            this.w = 0
            this.x = 2
            this.y = -1
            this.z = 2
        }
        
        var sndx = new makesoundex()
        
        // check to see that the input is valid
        function isSurname(name) {
            if (name == &quot;&quot; || name == null) {
                return false
            } else {
                for (var i = 0; i &lt; name.length; i++) {
                    var letter = name.charAt(i)
                    if (!(letter &gt;= &#39;a&#39; &amp;&amp; letter &lt;= &#39;z&#39; || letter &gt;= &#39;A&#39; &amp;&amp; letter &lt;= &#39;Z&#39;)) {
                        return false
                    }
                }
            }
            return true
        }
        
        // Collapse out directly adjacent sounds
        // 1. Assume that surname.length&gt;=1
        // 2. Assume that surname contains only lowercase letters
        function collapse(surname) {
            if (surname.length == 1) {
                return surname
            }
            var right = collapse(surname.substring(1, surname.length))
            if (sndx[surname.charAt(0)] == sndx[right.charAt(0)]) {
                return surname.charAt(0) + right.substring(1, right.length)
            }
            return surname.charAt(0) + right
        }
        
        // Collapse out directly adjacent sounds using the new National Archives method
        // 1. Assume that surname.length&gt;=1
        // 2. Assume that surname contains only lowercase letters
        // 3. H and W are completely ignored
        function omit(surname) {
            if (surname.length == 1) {
                return surname
            }
            var right = omit(surname.substring(1, surname.length))
            if (!sndx[right.charAt(0)]) {
                return surname.charAt(0) + right.substring(1, right.length)
            }
            return surname.charAt(0) + right
        }
        
        // Output the coded sequence
        function output_sequence(seq) {
            var output = seq.charAt(0).toUpperCase() // Retain first letter
            output += &quot;-&quot; // Separate letter with a dash
            var stage2 = seq.substring(1, seq.length)
            var count = 0
            for (var i = 0; i &lt; stage2.length &amp;&amp; count &lt; 3; i++) {
                if (sndx[stage2.charAt(i)] &gt; 0) {
                    output += sndx[stage2.charAt(i)]
                    count++
                }
            }
            for (; count &lt; 3; count++) {
                output += &quot;0&quot;
            }
            return output
        }
        
        // Compute the SOUNDEX code for the surname
        function soundex(value) {
            if (!isSurname(value)) {
                return null
            }
            var stage1 = collapse(value.toLowerCase())
            //form.result.value=output_sequence(stage1);
        
            var stage1 = omit(value.toLowerCase())
            var stage2 = collapse(stage1)
            return output_sequence(stage2);
        
        }
        
        function clean(u) {
            var u = u.replace(/\,/g, &quot;&quot;);
            u = u.toLowerCase().split(&quot; &quot;);
            var cw = [&quot;ARRAY OF WORDS TO BE EXCLUDED FROM COMPARISON&quot;];
            var n = [];
            for (var y = 0; y &lt; u.length; y++) {
                var test = false;
                for (var z = 0; z &lt; cw.length; z++) {
                    if (u[y] != &quot;&quot; &amp;&amp; u[y] != cw[z]) {
                        test = true;
                        break;
                    }
                }
                if (test) {
        //Don&#39;t use &amp; or $ in comparison
                    var val = u[y].replace(&quot;$&quot;, &quot;&quot;).replace(&quot;&amp;&quot;, &quot;&quot;);
                    n.push(val);
                }
            }
            return n;
        }
```

Compare Strings Javascript Return %of Likely

I am generating a image on client side and I display it with HTML like this:

    &lt;img src=&quot;data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMCAgICAgM....&quot;/&gt;

I want to offer the possibility to download the generated Image.

How can I realize that the browser is opening a file save dialoge (or just download the image like chrome or firefox to the download folder would do) which allows the user to save the image **without doing right click and save as** on the image?

I would prefer a solution without server interaction. So I am aware that it would be possible if I first upload the Image and then start the download.


Thanks a lot!

 


Browser/HTML Force download of image from src=&quot;data:image/jpeg;base64...&quot;

So I am making a script that adds two numbers (decimal numbers) together, which I have encountered a problem.

http://jsfiddle.net/DerekL/esqnC/

I made the script, it turns out pretty good:

    0.1 + 0.5  //0.6
    0.2 + 0.3  //0.5

But soon I see:

    0.1 + 0.2  //0.30000000000000004
    0.01 + 0.06  //0.06999999999999999

And it does not look right to me. I know it is a shortcoming of using float point with finite bits, but I can&#39;t find a way to fix that.

    Math.ceil   //No
    Math.floor  //No
    .slice      //No

**UPDATE**

Is it possible to multiply the numbers by 1000 first, then add them then divide it by 1000?

JavaScript adding decimal numbers issue

I know this may be a newbie question, but I&#39;m curious as to the main  benefit of  `eval()`  - where would it be used best? I appreciate any info.

What&#39;s the main benefit of using eval() in JavaScript?

I&#39;m writing a Chrome content script extension and I need to be able to target a specific element that, unfortunately, has no unique identifiers except its parent element.

I need to target the immediate first child element of `parentElement`. `console.log(parentElement)` reports both of the child elements/nodes perfectly, but the succeeding console logs (the ones that target the childNodes) always return an `undefined` value no matter what I do.

**This is my code so far**  
&lt;sup&gt;(I have excluded the actual names to avoid confusion and extra, unnecessary explanation)&lt;/sup&gt;

    function injectCode() {

        var parentElement = document.getElementsByClassName(&quot;uniqueClassName&quot;);

        if (parentElement &amp;&amp; parentElement.innerHTML != &quot;&quot;) {

            console.log(parentElement);
            console.log(parentElement.firstElementChild);
            console.log(parentElement.firstChild);
            console.log(parentElement.childNodes);
            console.log(parentElement.childNodes[0]);
            console.log(parentElement.childNodes[1]);

        } else {

            setTimeout(injectCode, 250);
        }	
    }

How do I select the first child element/node of `parentElement`?

![enter image description here][1]


  [1]: http://i.stack.imgur.com/0F5cA.png

**Update:**  
`parentElement.children[0]` also has the same error as `parentElement.childNodes[0]`.

Get immediate first child element

The regex `/abc$/` will match an `abc` that does appear at the end of the line. How do I do the inverse?

I want to match `abc` that isn&#39;t at the end of a line.

Furthermore, I&#39;m going to be using the regex to replace strings, so I want to capture only `abc`, not anything after the string, so `/abc.+$/` doesn&#39;t work, because it would replace not only `abc` but anything after `abc` too.

What is the correct regex to use?


What is a regex to match a string NOT at the end of a line?

So essentially I&#39;m looking for specifically a 4 digit code within two angle brackets within a text file. I know that I need to open the text file and then parse line by line, but I am not sure the best way to go about structuring my code after checking &quot;for line in file&quot;. 

I think I can either somehow split it, strip it, or partition, but I also wrote a regex which I used compile on and so if that returns a match object I don&#39;t think I can use that with those string based operations. Also I&#39;m not sure whether my regex is greedy enough or not...

I&#39;d like to store all instances of those found hits as strings within either a tuple or a list. 

Here is my regex: 

    regex = re.compile(&quot;(&lt;(\d{4,5})&gt;)?&quot;)

I don&#39;t think I need to include all that much code considering its fairly basic so far. 

How do I search for a pattern within a text file using Python combining regex &amp; string/file operations and store instances of the pattern?

I am trying to write a regular expression that will be used on a text box to validate its contents to see if it is between 1 and 35. The characters within the text box can be anything: numeric, alpha, punctuation, white space, etc. Here is what I have so far:

    ^[:;,\-@0-9a-zA-Z&#226;&#233;&#232;&#39;.\s]{1,35}$

As you can see, I have to list out all characters. Is there an easier way to say &quot;all&quot; characters?


Setting a minimum/maximum character count for any character using a regular expression

I am building search and I am going to use javascript autocomplete with it. I am from Finland (finnish language) so I have to deal with some special characters like &#228;, &#246; and &#229;

When user types text in to the search input field I try to match the text to data.

Here is simple example that is not working correctly if user types for example &quot;&#228;&#228;&quot;. Same thing with &quot;&#228;l&quot;

    var title = &quot;this is simple string with finnish word t&#228;m&#228; on &#228;&#228;kk&#246;stesti &#228;lk&#228;&#228; ihmetelk&#246;&quot;;
    // Does not work
    var searchterm = &quot;&#228;l&quot;;
    
    // does not work
    //var searchterm = &quot;&#228;&#228;&quot;;
    
    // Works
    //var searchterm = &quot;wi&quot;;
    
    if ( new RegExp(&quot;\\b&quot;+searchterm, &quot;gi&quot;).test(title) ) {
        $(&quot;#result&quot;).html(&quot;Match: (&quot;+searchterm+&quot;): &quot;+title);
    } else {
        $(&quot;#result&quot;).html(&quot;nothing found with term: &quot;+searchterm);   
    }

[http://jsfiddle.net/7TsxB/][1]


  [1]: http://jsfiddle.net/7TsxB/


So how can I get those &#228;,&#246; and &#229; characters to work with javascript regex? 

I think I should use unicode codes but how should I do that? Codes for those characters are:
[\u00C4,\u00E4,\u00C5,\u00E5,\u00D6,\u00F6]

=&gt; &#228;&#196;&#229;&#197;&#246;&#214;


Javascript RegExp + Word boundaries + unicode characters

I need to match all of its lines that contains a value and that don&#39;t have a given prefix.

Example:
I want all lines that contains &lt;code&gt;word&lt;/code&gt; when it&#39;s not prefixed by &lt;code&gt;prefix&lt;/code&gt;

So:

    foobar -&gt; no match
    prefix word -&gt; no match
    prefix word suffix -&gt; no match
    word -&gt; MATCH
    something word -&gt; MATCH

What I&#39;ve tried so far:

    (?!prefix)word

Doesn&#39;t seem to do what I want 


Regex to match specific strings without a given prefix

I am building a mobile application that will target iPhone/iPad and Android phones. The application will involve users taking photos and uploading to my server and later on the users will be able to look at those photos on their mobile devices (although not necessarily their own photos so an Android user might be looking at a photo taken with an iPhone).

Which sizes should I save the photos to be able to cover the most use cases? iPads are 1.333 W/H, most mobile phones are 1.5 or 1.333 W/H with some rare 1.666 W/H. Specifically:

iPad: 1024x768, iPad3: 2048x1536, iPhone and some other phones: 960x640, 480x320, 800x480.

To be able to keep it manageable, I need to decide on a few certain image sizes and save the photos in those sizes. I am not really looking for help on the technical side. I can do image scaling on the server side etc. I am looking for recommendations / best practices / lessons learned about image sizes before I go too far into building it.

* Which sizes should I save the photos in to cover the most use cases?
* Do you recommend any client side scaling before uploading to server to save on transfer time (for example scaling down 2048x1536 iPad photos) or should I always transfer originals?
* How should I handle incompatible image sizes (showing a picture taken with an iPad on an Android device for example)? Should I pre-cut those images on my server before sending to client or should I let the client phone handle image resizing?
* There is also the issue of UI. There will be other things on the page other than the photo maybe a button or two for navigation. Should I go for something smaller than the full screen size while keeping the same aspect ratio when saving pictures?

I know some of these questions don&#39;t have one answer and the answers are relative but I wanted to get some opinions. Thanks.


Image Size Best Practices for Mobile Application

I am using PIL to resize the images there by converting larger images to smaller ones. Are there any standard ways to reduce the file size of the image without losing the quality too much, lets say the original size of the image is 100KB, i want to get it down to like 5 or 10 KB especially for png and jpeg formats.

How to reduce the image file size using PIL

I&#39;m not familiar with PIL, but I know it&#39;s very easy to put a bunch of images into a grid in ImageMagick.

How do I, for example, put 16 images into a 4&amp;times;4 grid where I can specify the gap between rows and columns?

How do you merge images into a canvas using PIL/Pillow?

I found a quite [large list of available libraries][1] on Node.JS wiki but I&#39;m not sure which of those are more mature and provide better performance. Basically I want to do the following:

 1. load some images to a server from external sources
 2. put them onto one big canvas
 3. crop and mask them a bit
 4. apply a filter or two
 5. Resize the final image and give a link to it

Big plus if the node package works on both Linux *and Windows*.

  [1]: https://github.com/joyent/node/wiki/modules#wiki-graphics

Content Type	Original Author	Original Content on Stackoverflow
Question	prcaen	View Question on Stackoverflow
Solution 1 - Javascript	g13n	View Answer on Stackoverflow

Regex JavaScript image file extension

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

What is the best way to handle an ExecutionException?

How do I count columns of a table

Attributions