preg_match IMG tag matches src with quotes not single quote also

at line 375 of the file resp_img.module

you can fine the code:

preg_match('/src=("[^"]*")/i', $img, $src);

which will match image tags like <img src="path/to/image.jpg" />
but not <img src='path/to/image.jpg' />

Addition of pregmatch single quotes can help,
as i used the resp_img by using php filter in a basic page (i did't use image field) , i used php to generate image style,
and I put <img src='path/img.jpg' /> with single quotes which showed some errors