How can I match the outer bracket with grep -

i want extract lines file in form of

t[0-9]-[0-9][.*

eg:

t1-3[1: 139343400 -- 81586290 --> 220929690]

i tried grep t[0-9]-[0-9]\\[.* i'm getting following output.

grep: unmatched [ or [^

any suggestions/comments regarding extracting above type of line appreciated.

are sure tried

grep t[0-9]-[0-9]\\[.*

that should fine. if do

grep t[0-9]-[0-9]\[.*

then you'll "unmatched [" because "[" converted shell "[".

you can do

grep 't[0-9]-[0-9]\[.*'

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