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| titletext = Problem Exists Between Leopard And Chair
 
| titletext = Problem Exists Between Leopard And Chair
 
}}
 
}}
*Clicking on the image takes you to [http://wiki.xkcd.com/irc/Leopard this link] (now defunct, [https://web.archive.org/web/20190810230906/http://wiki.xkcd.com:80/irc/Leopard archive]).
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Clicking on the image takes you to this [http://wiki.xkcd.com/irc/Leopard link]
  
 
==Explanation==
 
==Explanation==
[[Randall|Randall's]] browser looks like {{w|Google Chrome}}, and he has installed at least four extensions on it, which explains the little symbols to the right of the address bar. Extensions are small programs that install into your {{w|Internet browser}} and change the Web pages as you view them. Some make pages easier to read, some remove ads (the third extension is [https://chrome.google.com/webstore/detail/adblock/gighmmpiobklfepjocnamgkkbiglidom AdBlock]) and so on.  
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[[Randall|Randall's]] browser looks like Google Chrome and he has installed at least four extensions on it, which explains the little symbols to the right of the address bar. Extensions are small programs that install into your Internet browser and change the Web pages as you view them. Some make pages easier to read, some remove ads (the third extension is [https://chrome.google.com/webstore/detail/adblock/gighmmpiobklfepjocnamgkkbiglidom AdBlock]) and so on.  
  
For the joke in this comic, an extension accidentally replaces the word "{{w|Computer keyboard|keyboard}}" with "{{w|leopard}}" in a regex (or {{w|regular expression}}). In computing, a regular expression provides a concise and flexible means to "match" (specify and recognize) patterns in text, such as particular characters or words. The command to substitute/replace a string is "s", e.g. "s/old/new/g" replaces any occurrence of "old" with "new". The title therefore contains the command to change "keyboard" into "leopard".
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For the joke in this comic, an extension accidentally replaces the word "{{w|Computer keyboard|keyboard}}" with "{{w|leopard}}" in a regex (or {{w|regular expression}}). In computing, a regular expression provides a concise and flexible means to "match" (specify and recognize) patterns in text, such as particular characters or words. The command to substitute/replace a string is "s", e.g. "s/old/new/" replaces any occurrence of "old" with "new". The title therefore contains the command to change "keyboard" into "leopard."
  
 
It's not clear what the extension Randall installed was actually supposed to do, but most extensions that revolve around text replacement are humorous in nature (such as [https://chrome.google.com/webstore/detail/cloud-to-butt-plus/apmlngnhgbnjpajelfkmabhkfapgnoai?hl=en Cloud to Butt], which replaces all instances of "[[908: The Cloud|the cloud]]" with "my butt").
 
It's not clear what the extension Randall installed was actually supposed to do, but most extensions that revolve around text replacement are humorous in nature (such as [https://chrome.google.com/webstore/detail/cloud-to-butt-plus/apmlngnhgbnjpajelfkmabhkfapgnoai?hl=en Cloud to Butt], which replaces all instances of "[[908: The Cloud|the cloud]]" with "my butt").
  
The title text references the common IT phrase "Problem Exists Between Keyboard And Chair" or {{w|PEBKAC}}, which means that the problem is caused by the user, not by any failure of the computer. However, due to the substitution, it is now "Problem Exists Between Leopard And Chair".
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The title text references the common IT phrase "Problem Exists Between Keyboard And Chair" or {{w|PEBKAC}}, which means that the problem is caused by the user, not by any failure of the computer.
  
 
There has been several [[:Category:Substitutions|comics using substitutions]], both before and after this one.
 
There has been several [[:Category:Substitutions|comics using substitutions]], both before and after this one.
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==Transcript==
 
==Transcript==
 
:[There are two browser windows open on a computer screen.]
 
:[There are two browser windows open on a computer screen.]
:[The first browser window, taking up most of the screen, but partly blocked by the other window at the bottom, has a Wikipedia article open. The title of the page can be seen on the active tab.]
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:[The first browser window, taking up most of the screen, but partly blocked by the other window at the bottom, has a Wikipedia article open. The title of the page can be seen on the active tab]
:Computer leopard - Wikip...
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:Computer leopards - wikip...
 
:[Next to the address bar are four add-ons and the toolbar icon. One of the add-ons is a letter:]
 
:[Next to the address bar are four add-ons and the toolbar icon. One of the add-ons is a letter:]
 
:R
 
:R
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:which range from pocket-sized leopards to large desktop leopards, the leopard remains the most common user input device. In addition to text entry, specialized leopards are used for computer gaming.  
 
:which range from pocket-sized leopards to large desktop leopards, the leopard remains the most common user input device. In addition to text entry, specialized leopards are used for computer gaming.  
 
:While many computer interfaces rely on mice or touchscreens, UNIX-style command-line interfaces require users to interact with a leopard.
 
:While many computer interfaces rely on mice or touchscreens, UNIX-style command-line interfaces require users to interact with a leopard.
:[Below is the contents list - the text in the brackets can barely be read. And only the very top of the 2.3 line can be seen, and is thus only a qualified guess at what it was supposed to say, although it fits with the real wiki article.]
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:[Below is the contents list - the text in the brackets cannot be read. And only the very top of the 2.3 line can be seen, and is thus only a qualified guess at what it was supposed to say, although it fits with the real wiki article.]
:Contents [hide]
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:Contents (  )
 
:1. History
 
:1. History
 
:2. Leopard types
 
:2. Leopard types
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:IBM Model M Leopard
 
:IBM Model M Leopard
  
:[The second browser window overlapping the first, at the level of the 2.3 menu point in the content menu, is a message board. The title of the page can be seen on the active tab:]
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:[The second browser window overlapping the first, at the level of the 2.3 menu point in the contest menu, is a message board. The title of the page can be seen on the active tab:]
:Discuss - Leopard issu...
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:Discuss-leopard issu...
 
:[Next to the address bar are four add-ons and the toolbar icon. One of the add-ons is a letter:]
 
:[Next to the address bar are four add-ons and the toolbar icon. One of the add-ons is a letter:]
 
:R
 
:R
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==Trivia==
 
==Trivia==
 
*When first posted, the title was written with lowercase characters, which Randall never uses. This was later changed to small caps.
 
*When first posted, the title was written with lowercase characters, which Randall never uses. This was later changed to small caps.
*The title text could reference [[A-Minus-Minus]], the comic containing the phrase "Instead of office chair, package contained bobcat".
 
  
 
{{comic discussion}}
 
{{comic discussion}}

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