I have the following data:

1 I want to delete this line
2 I want to delete that line

How can I use sed to delete form "to **** line'

my data after shed should be:

1 I want
2 I want

How can I sed start with a letter in the middle of the line and end in that line?

Thanks!

[^ ]+ match any number > 1 of anything that is not a space
[ ]+ match any number of spaces
.* match every thin else
\( \) copy whatever matches to hold
\1 the contents of the first hold entry

so essentially, I'm telling it to replace the whole line with the first three columns.

Dear Reborg,
would u plz explain, what exactly is happening in the sequence.

see added comments above.