Stop printing when non-comment lines are reached

[Hans Lonsdale]

I am printing between sections of the following form

---------
## FAML [ASMB] keyword,keyword  

## Some text

## END OF FAML [ASMB]
---------

I have encountered a problem that occurs when "## END OF FAML [ASMB]" is not 
reached. 
I want to stop as soon as lines not starting with comment characters "##" are 
encountered.

For instance, I want to stop upon reaching "Some code" even though it did not 
find
"## END OF FAML [ASMB]" because the line does not start with "##".

---------
## FAML [ASMB] keyword,keyword  

## Some text

## End OF FAL

Some code
--------

This is the implementation

    spc='[[:space:]]*'
    gph="[[:graph:]]+"
    cmt='\/\/'
    ebl='\['
    ebr='\]'

    local pn_ere="^[[:space:]]*([#;!]+|@c|${cmt})[[:space:]]+"
    local kys="(([^,]+)(,[^,]+)*)?"

    nfaml=${faml:-"[[:graph:]]+"}
    nasmb=${asmb:-"[[:graph:]]+"}

    beg_ere="${pn_ere}${nfaml} ${ebl}${nasmb}${ebr}${spc}${kys}$"
    end_ere="${pn_ere}END OF ${nfaml} ${ebl}${nasmb}${ebr}${spc}$"

    sed -E -n "/$beg_ere/,/$end_ere/ {
         /$end_ere/z; s/$pn_ere// ; p
      }" "$filename"



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