lucy24 - 10:32 am on Oct 17, 2013 (gmt 0)
src ?= ?"([^"]+)"
The part in parentheses.
How consistent is the overall pattern? I'm seeing
<img border=0 width=\d+ height=\d+ id="\w+" src="cid:\w+\.jpg@\w+\.\w+">
but don't know how much of that would remain accurate in other cases. Is it always @01CECA91.641305C0 ?