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<?php $str = '<img src="uploads/1.jpg"> Привет <img src="uploads/2.gif">'; $pattern = '/(src=")(.*")/U'; $replacement = '$1domain.com/$2'; echo preg_replace($pattern, $replacement, $str);
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<img src="domain.com/uploads/1.jpg"> Привет <img src="domain.com/uploads/2.gif">