Printing sections from files with sed

[Hans Lonsdale]

I want to print lines according to the following description

  ## FM [TOBIN]
  ## Some text
  ## More text
  ## END OF FM [TOBIN]

I provide 

faml="FM"
asmb="TOBIN"

Here I set the matching patterns and call sed 


      pn_ere='^[[:space:]]*([#;!]+|@c|//)[[:space:]]'
      beg_re="${pn_ere}${faml} \[${asmb}\][[:space:]]*$"
      end_re="${pn_ere}END OF ${faml} \[${asmb}\][[:space:]]*$"

      sed -n "/$beg_re/,/$end_re/ {
          /$beg_re/d ; /$end_re/z; s/${pn_ere}// ; p
        }" "$filename"

I get the error 

sed: -e expression #1, char 27: unknown command: `/'


Initially thought the problem could be that either the vars are misspelled, or 
for some
other reason one or both don't have values. 

But checking things again did not show any misspelled vars or empty values,




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