Bug: SVG size

[tuncbkose]

Hi, I just noticed that some of my svg files, obtained for example from dvisvgm, specify their size with width='{number}pt' and height='{number}pt'. For these files, the regex in

imagesize_py/imagesize/imagesize.py

Lines 204 to 215 in 8d88ec6

	# handle SVGs
	elif size >= 5 and (head.startswith(b'<?xml') or head.startswith(b'<svg')):
	fhandle.seek(0)
	data = fhandle.read(1024)
	try:
	data = data.decode('utf-8')
	width = re.search(r'[^-]width="(.*?)"', data).group(1)
	height = re.search(r'[^-]height="(.*?)"', data).group(1)
	except Exception:
	raise ValueError("Invalid SVG file")
	width = _convertToPx(width)
	height = _convertToPx(height)

doesn't match due to the different quotation marks.

I imagine one can naively change the regex to have something like ["|'], but then you would be matching incorrect strings like "wrong'. I'm sure this is a solved problem that is beyond my regex knowledge, but it would be nice for this to be fixed.