graphID  = regexp.MustCompile(`<g id="graph\d"`)
	svgClose = regexp.MustCompile(`</svg>`)
)

// massageSVG enhances the SVG output from DOT to provide better
// panning inside a web browser. It uses the svgpan library, which is
// embedded into the svgpan.JSSource variable.
func massageSVG(svg string) string {
	// Work around for dot bug which misses quoting some ampersands,
	// resulting on unparsable SVG.