Regex to parse image data URI

If I have :

<img src="data:image/gif;base64,R0lGODlhtwBEANUAAMbIypOVmO7v76yusOHi49AsSDY1N2NkZvvs6VVWWPDAutZOWJ+hpPPPyeqmoNlcYXBxdNTV1nx+gN51c4iJjEdHSfbc19M+UOeZk7m7veSMiNtpauGBfu2zrc4RQSMfIP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAAAAAAALAAAAAC3AEQAAAb/QJBwSCwaj8ikcslsOp/QqHRKrVqv2Kx2y+16v+CweEwum8/otHrNbrvf8Lh8Tq/b7/i8fs" />

How can I parse the data part into:

• Mime type (image/gif)
• Encoding (base64)
• Image data (the binary data)