Use:
select * 
from 
   sys.procedures 
where 
   name like '%name_of_proc%'
Look at the syscomments table if you require the code.
select text 
from 
    syscomments c
    inner join sys.procedures p on p.object_id = c.object_id
where 
    p.name like '%name_of_proc%'
I hope this helps you.