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Your statement of what you're trying to do is ambiguous. Writing a regular expression to match 01, 03, 05, 07, 10, or 11 in character positions 9 and 10 is easy (and RudiC has shown you REs that do...

You said you wanted the 11? Why, then, is the second "wrong" wrong?


In your regex, you want 00 in positions 9 and 10. And, you may want to reread the regex documentation, as (man regex): So...

sorry forgot 01:

sed -e '/^[0-9]\{8\}0[1357]/d'

something along these lines:

sed -e '/^[0-9]\{8\}0[357]/d'