LIKE not using indexes (due to locale issue?)

explain select * from d_trr where revision like '^B2.%.SX'
--where ast_revision  = 'B2.M.SX'

Seq Scan on d_trr  (cost=0.00..2268460.98 rows=1 width=16)
  Filter: ((revision)::text ~~ '^B2.%.SX'::text)

show lc_collate;
en_US.UTF-8

Is it that this is handled by tsearch2? Or I need to do the locale to
"C" for this to function?

the revision is indexed.

Bitmap Heap Scan on d_trr  (cost=4492.43..547709.26 rows=193453
width=16)
  Recheck Cond: ((revision)::text = 'B2.M.SX'::text)
  ->  Bitmap Index Scan on idx_d_trr_iw_ast  (cost=0.00..4444.06
rows=193453 width=0)
        Index Cond: ((revision)::text = 'B2.M.SX'::text)