CODEWITHSUNDEEP
phpregexpreg-replace
Ali
Ali

Reputation: 243

preg_replace and combination of '[', ']' and '/' for replacement

I want to use preg_replace for combination of '[', ']' and '/' but I could'nt find the right way!

I have these strings:

$str = "This is a [u]PHP[/u] test . This is second[/u] test.
 This [u]is another [u]test[/u].";

$url = "http://www.test.com";

In result I want to have :

str1 = "This is a <a href='http://www.test.com'>PHP</a> test . 
 This is second[/u] test.
This <a href='http://www.test.com'>is another [u]test</a>.";

and also [u]=[U], [/u]=[/U] are case insensitive.

Upvotes: 0

Views: 1201

Answers (3)

Lake
Lake

Reputation: 913

Well,i think what you want is 

$str = "This is a [u]PHP[/u] test . This is second[/u] test.
 This [u]is another [u]test[/u].";

$url = "http://www.test.com";

echo preg_replace('#\[u\]((?:(?!\[/u\]).)*)\[/u\]#is',"<a href='{$url}'>\\1</a>",$str);

((?:(?!\[/u\]).)*) means it would match some characters which don't including string '[/u]'

Upvotes: 1

Shiplu Mokaddim
Shiplu Mokaddim

Reputation: 57650

$str1 = preg_replace('#\[(u|U)\](.*?)(?=\[/\1)\[/\1\]#', "<a href='http://www.test.com'>$2</a>", $str);
var_dump($str, $str1);

Output

string(85) "This is a [u]PHP[/u] test . This is second[/u] test.
 This [u]is another [u]test[/u]."
string(139) "This is a <a href='http://www.test.com'>PHP</a> test . This is second[/u] test.
 This <a href='http://www.test.com'>is another [u]test</a>."

Upvotes: 1

Linus Kleen
Linus Kleen

Reputation: 34632

Assuming no opening square brackets inside the [u] tags:

preg_replace('~\[u\]([^[]+)\[/u\]~i', '<a href="'.$url.'">$1</a>', $str);

The regular expression explained:

  • ~ is used as delimiter to avoid leaning slash syndrome
  • \[ and \] match literal square brackets
  • ( and ) denote a capture group which in the replacement string is $1
  • [^[]+ matches anything but an opening square bracket once or more
  • i modifier makes the regular expression case insensitive.

Upvotes: 1

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