Find and Display a line with a value (eg. ;value)

sed -n '/startpattern/,/endpattern/{s/;value//p}' Filepath

Print Value Between Two patterns Exclusive ( Single Line ):

sed 's/.pattern1(.)pattern2.*/\1/'

eg.Following code displays value between < and >

sed 's/../\1/'

Print Value Between Two patterns Exclusive ( Multi Line ):

sed -n '/Start/,/End/{/Start|End/!p}' Filename