Access VBA - Search field for string where string does not have number immediately before or after

I have some VBA code in Access to look in a string field and return records that contain another string.

For example:

SearchField may be:

BB13118000022,SUPPORT PROFILE TURN CAP


and I want to return the record if the string (strfind) is 3118000022

The statement below returns the proper records

strcriteria = "SearchField  LIKE '" & "*" & strfind & "*" & "'"


However, if the character immediately before or after strfind is a number, I do not want to return that record.

I tried
'remove records with number before strfind      
  strcriteria = "SearchField  NOT LIKE '" & # & "*" & strfind & "*" & "'"
'remove remainin records with number after strfind
  strcriteria = "strcriteria  NOT LIKE '" & "*" & strfind & "*" & # & "'"  
'remaining records, return with strfind  
  strcriteria = "strcriteria  LIKE '" & "*" & strfind & "*" & "'"

it failed on the # symbol