如何从段落中剥离图像，然后将其移动到段落的开头

I am trying to figure out how to move an image in a small paragraph of text using regex, so that for example:

this is a <img src="image.jpg" /> paragraph

turns into

<img src="image.jpg" /> this is a paragraph

Does anyone have any ideas please

Simplified match, but will do for faux-XHTML:

 $src = preg_replace('/^(.*?)(<img[^>]+>)/m', '$2 $1', $src);
                       |   |    |                  |
           start of line   |    the img tag        switching
                         everything that follows   positions

This assumes you consider the start of a line the start of a paragraph.

Since this is your second regex question, I'd like to hint at reading http://www.php.net/manual/en/reference.pcre.pattern.syntax.php and http://regular-expressions.info/