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Regular Expression PHP to replace <textarea/>

I want to replace with For example I have this one:

 <textarea type="text" style="height: 30px; width: 144px;" name="a" id="a" value=""/>

and I want it to become:

 <textarea type="text" style="height: 30px; width: 144px;" name="a" id="a" value=""></textarea>

I using this regular expression:

 preg_replace('!<textarea.*/>!', '<textarea.*></textarea>', $text);

but is not working. I am quite new to regular expressions so it would be very nice if someone could help me with this. Thanks in advance

<?php
$text = '<textarea type="text" style="height: 30px; width: 144px;" name="a" id="a" value=""/>';

$text = preg_replace('/<textarea(.*?)\/>/', 
                     '<textarea$1></textarea>', $text);
print $text;

Prints:

<textarea type="text" style="height: 30px; width: 144px;" name="a" id="a" value=""></textarea>

$try this code:

$s= '<textarea type="text" style="height: 30px; width: 144px;" name="a" id="a" value=""/>';
echo $a= str_replace("/>","></textarea>",$s);

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