Remove tailing characters

Question

Please tell me way to remove = and newline character \n from the end of string which is embedded between <>.

For example input string

set string "abcd  1234   abc=
"

i just want to remove = and new line from end

Answer 1

If you want to remove all = and newlines from the end, no matter how much there are, I suggest string trimright

set string "abcd  1234   abc=
"
string trimright $string =\n
set str2 "abc===="
string trimright $str2 =\n ; returns abc

If you know that the last 2 characters are =\n, you can also use string range

string range $string 0 end-2

For more complex solutions, regexp is appropriate.