Patching multiple files with same text

[WU SHI-KUEI]

'Ed' and a 'here' document will do what you need.  E.g:

for i in file1 file2 ......
do
ed $i << THE_END
g/RE_1/.,/RE_2/c\\
new text, with each new line escaped
w
.
THE_END
done

Where RE_1 (RE_2) matches the first (last) line of the text that must be
replaced.