Specify expression in LIKE operator

How can specify expression in LIKE operator

I want 开发者_运维问答to select all row in table where column Name starts with a-zA-Z followed by # and does not have two dots together (..)

i tries this WHERE NAME LIKE '%[a-zA-Z]#'

WHERE name LIKE '[a-zA-Z]#%' AND NOT (name LIKE '%..%')

WHERE Name LIKE '[A-Za-z]#%'
    AND Name NOT LIKE '%..%'