Regular Expressions Cheat Sheet

Also, this serves as a useful reminder when returning to regular expressions.

15 PHP regular expressions for web developers

Reblogged from Hungry for Knowledge:

Here is a good guide on how to exclude files and directories from SVN.

How annoying.

UPDATE:
Here is a simple way to take back that screen session.

screen -D -r '1234.somescreensession'

Kudos to Donncha O’Caoimh

Here is a way a longer way to remove the process that is attached to that screen session, so you can reattach to it and continue with whatever you were doing.

• figure out which tty is holding on to the screen session by typing into terminal
  ps -ef | grep screen | grep tty
• result of this should be something like
  testdev 5760 5688 0 12:31 ttyp1 00:00:00 screen -r 1234.somescreensession
• in this case the tty is 5688, use this to find the login bash that is associated with that tty
  ps -ef | grep bash | grep 5688
• result of this should be something like
  testdev 5688 5687 0 12:28 ttyp1 00:00:00 -bash
• kill process
  kill -9 5687

Now you should be free to re-attach to this screen session.

Kudos to David Mackintosh 

Breakdown of MySQL Field Types with their corresponding sizes.

sudo /Developer/Library/uninstall-devtools –mode=all

In my case, I was using migration assistant to migrate my applications and user account to a new laptop. My older laptop had an older version of Xcode that I didn’t want included in the migration and as it is so big, I didn’t want to take the chance.

Kudos to Pushkararora.com

The syntax is straightforward. Any attribute prefixed with data- will be treated as data storage.

<div class="test" data-foo="bar"></div>

jQuery accesses this data like so…

var data = $( 'div.test' ).data( 'foo' ); // returns bar

Support for the data attribute has been added since jQuery version 1.4.3. jQuery’s implementation is smart enough that it can parse the attribute easily and even determine the correct data type used.

What I have found really useful is the fact that the jQuery can parse JSON syntax and return a JSON object. This makes passing data in PHP trivial, using the json_encode method. We also need to use htmlspecialchars method to escape or convert any quotes in the JSON string.

<?php  
$test = array( 'row' => 1, 'col' => 6, 'color' => 'pink' ); //create array of data you want to pass to jquery
$test = json_encode( $test ); //convert array to a JSON string
$test = htmlspecialchars( $test, ENT_QUOTES ); //convert any quotes into HTML entities so JSON string behaves as a proper HTML attribute.
?>
<div class="test" data-complex="<?php echo $test ; ?>"></div>

The jQuery parses the JSON string like so…

var test = $( 'div.test' ).data( 'complex' ); // returns JSON Object

console.log( test.color ); // outputs pink!

Important to note that this method is also backward compatible with older browsers, so there is no excuse not to give it a go!

If you are having difficulty installing iWorks 09 from the DVD, then this is what I went through to finally get it to work.

• Bought iWorks 09 from the Apple store, and they sent the software on a DVD (how retro!).
• Tried to install the software, but each time I was asked for a serial number or to install from the DVD.
• No serial number could be found on box, inside box, on disc etc. Confusion reigned.
• Figured as a trial version of iWorks was installed that perhaps my Mac was also confused.
• Removed the application from the Applications directory and removed any iWorks cache files from Library/Caches directory.
• Reinstalled and this time it crashed when loading… sigh.
• After a long search, I found a full list of what I need to delete to make sure no trace of iWorks exist (below).
• Restarted Mac, reinstalled and registered, I’m now good to go.

/Macintosh HD/Applications/iWork '09 (folder)
/Macintosh HD/Library/Receipts/iWork09* (any file in this folder that refers to iWork)
/Macintosh HD/Library/Preferences/com.apple.iWork09.plist
/Macintosh HD/Library/Preferences/com.apple.iWork09.Installer.plist
/Macintosh HD/Library/Application Support/iWork '09 (folder)
/Macintosh HD/Library/Application Support/iWork (folder--if present)
/username/Library/Application Support/iWork (folder)
/username/Library/Preferences/ByHost/com.apple.iWork.Pages.NUMBER.plist
/username/Library/Preferences/ByHost/com.apple.iWork.Keynote.NUMBER.plist
/username/Library/Preferences/ByHost/com.apple.iWork.Numbers.NUMBER.plist
/username/Library/Preferences/ByHost/com.apple.iWork.NUMBER.plist
/username/Library/Preferences/com.apple.iWork.Pages.plist
/username/Library/Preferences/com.apple.iWork.Keynote.plist
/username/Library/Preferences/com.apple.iWork.Numbers.plist
/username/Library/Preferences/com.apple.iWork.plist

[NOTE:: Not sure if it's relevant, but I used terminal to delete these files as I didn't trust Mac Finder at this stage!]

If you have the IP addresses, then it is trivial.

//First check IP address is valid
$request_ip = $_SERVER['REMOTE_ADDR'];

if ( !preg_match( "/^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/", $request_ip ) )
    return false;

$blacklist = array(
'111.222.12.11',
'222.111.21.22',
'221.112.11.12'
);

//check that ip is not blacklisted
if ( in_array( $request_ip, $blacklist ) )
    return false;

If you want to include a range of IP addresses, best to use a regular expression.

$blacklist_ip_range = array(
    '/^122\.244\.(\d+)\.(\d+)/', //for IP address in the range 122.244.0.0 - 122.244.255.255
    '/^123\.(\d+)\.(\d+)\.(\d+)/', //for IP address in the range 123.0.0.0 - 123.255.255.255
);

foreach( $blacklist_ip_range as $ip ) {
    if( preg_match( $ip, $request_ip ) )
       	return false;
    }

If you have a better solution, then please let me know.

var element = document.getElementById( 'some_element_id' );

element.style.cssFloat = 'left';

It appears the Mac mail client could not connect to the outgoing Gmail SMTP server, smtp.gmail.com, then after a few hours the connection would be restored automatically.

I assumed that my settings must be fine as they remained constant, it must be a problem on the Gmail servers end, but it was happening too often for that to be plausible.

So I used the connection doctor to see what was happening under the hood.

To access the connection doctor, go to the Windows->Connection Doctor option in your Mac mail menu.

First thing I noticed was that I was trying to connect to a bunch of different outgoing servers. This is because I had set up separate email accounts (another Gmail and Yahoo mail account). It couldn’t connect to any of them, which was suspicious in itself.

Slash and burn time. I edited my SMTP servers list and I removed the 2 other outgoing servers that I never used, leaving me the one server that I always tried to use.

I ran the connection doctor again and watched the output window.

Failed to connect again, bummer. But I noticed it was using port 25 when trying to connect. That’s not right I thought, it should use port 465 if it’s using SSL. Gmail expects you to use SSL, when connecting and to use port 465.

So I edited the remaining outgoing server connection settings by doing the following.

• Went back to editing SMTP list (described above)
• Clicked on remaining server
• Clicked on Advanced Tab

Instead of choosing ‘Use default posts‘, I specified a custom port 465 and made sure the ‘Use Secure Sockets Layer (SSL)‘ checkbox was checked.

Saved settings.

Returned to connection doctor. This time I again failed to connect (boo!) but I got a different error (yay!). Authentication failed. Huh? I didn’t change anything, how did that happen… hmm.

Now I returned to edit the remaining outgoing server. Made sure the Password option was set and I re-entered my account username & password.

Saved settings again.

At this point, I was a little exasperated so I also tried unlocking my Gmail account. I was aware that Gmail lock accounts if they detect unusual behavior, so I made sure my Gmail account was unlocked by going to https://www.google.com/accounts/UnlockCaptcha.

Tried the connection doctor again and sweet baby zeus it connected.

Unfortunately, I cannot say for certain what was the issue. I had tried unlocking the account before I started this and it didn’t connect, so it wasn’t just that.

Anyway, thought I’d post what I tried, might help someone… might also waste 10 minutes of some punter’s life!