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Regex: remove duplicate slashes [PHP]

Posted on 2009-04-02
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Last Modified: 2012-05-06
I want to get rid of all duplicate slashes, for example:

Hello // world ////, how are/// you?

Should become:

Hello / world /, how are/ you?
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Question by:level9wizard
5 Comments
 
LVL 15

Expert Comment

by:yuk99
ID: 24050924
s/\/+//
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LVL 13

Assisted Solution

by:marchent
marchent earned 520 total points
ID: 24050927

$str = "Hello // world ////, how are/// you?";
$str = preg_replace('|/+|', '/', $str);
print "$str\n";

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LVL 15

Assisted Solution

by:yuk99
yuk99 earned 80 total points
ID: 24050937
Sorry. s/\/+/\//
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LVL 15

Accepted Solution

by:
fsze88 earned 1200 total points
ID: 24051004
<?
$str = 'Hello // world ////, how are/// you?';

$pattern = '/\/+/';
$replacement = '/';
echo preg_replace($pattern, $replacement, $str);

?>
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LVL 3

Assisted Solution

by:FirestormX
FirestormX earned 200 total points
ID: 24053186
As a quick explanation to what everyone's written above, PHP's regex patterns are simply strings, with a / at the begining and end of the pattern, which is why they're putting a \ in front of the /, to "escape" the character. So baiscally /\/+\//, actually becomes a pattern of /+/

Then + sign means to look for 1 or more instance of the previous character, which in this case, is /. It then checks to see if after it finds as many of / as possible, to make sure the last character is /.  
So translated, it means "find one or more /, that ends in /, and replace everything it finds with a single /".
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