extract number out of a sytle attribute

Hello

Could someone help me with this? I want to get the number out of a style width rule, for instance

if I have

style="width120px"; 

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I want to get that 120 . I have the string in my PHP code.

like this

$var = 'style = "width:120px" ';

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so basically what I want is to take this variable $var apply a regular expression to it ,  and the the 120 back


Cheers