sed提取两种模式

Question

I need to extract the lines between "Timing exception" and "---------" from the report below, then output them to a file

Timing exceptions with no effect exception's 
report timing -paths [eval [::legacy::get_attribute paths <exception>]]
/designs/exceptions/path_groups/
-----------------------------------

Summary
 Loop-breaking cells for combinational feedback                   0
 Nets with multiple drivers                                       0
 Timing exceptions with no effect                                 5
 Suspicious multi_cycle exceptions                                0
 Outputs without clocked external delays                          0

                                                  Total:          5

I've tried sed -n '/Timing exceptions/,/-----/p' filename , but it always return

Timing exceptions with no effect exception's 
report timing -paths [eval [::legacy::get_attribute paths <exception>]]
/designs/exceptions/path_groups/
-----------------------------------
 Timing exceptions with no effect                                 5
 Suspicious multi_cycle exceptions                                0
 Outputs without clocked external delays                          0

                                                  Total:          5

I only want the upper 4 lines but I don't know how to get rid of the lower lines. Could anyone please help me? Thank you very much!

Answer 1

Add ^ before Timing exceptions to indicate start of the line:

sed -n '/^Timing exceptions/,/-----/p' file.txt 

You have Timing exceptions in two lines, one at first, and the other after the ---- line, so you are getting two chunks, one for first one upto the ---- line, and the other from the second Timing exceptions till end as there is no line with ---- afterwards.

We have used ^ before Timing exceptions so that we can only match the first chunk as in second chunk the Timing exceptions does not come at start of the line.

Example:

% sed -n '/^Timing exceptions/,/-----/p' file.txt 
Timing exceptions with no effect exception's 
report timing -paths [eval [::legacy::get_attribute paths <exception>]]
/designs/exceptions/path_groups/
-----------------------------------

Answer 2

heemayl's answer truly complete. However, here is an alternate approach using awk .

awk '/^Timing exceptions/,/-----/' infile
Timing exceptions with no effect exception's
report timing -paths [eval [::legacy::get_attribute paths <exception>]]
/designs/exceptions/path_groups/
-----------------------------------