Remove a block (like a comment block) if this one contains a defined pattern in a specific file

remove_block_if_pattern_found.sh

# Remove a block beginning with $1, ending with $2 if it contains $3, in file $4
# $1 and $2 are sed regexp escaped surrounded with '/'
# Example: remove_block_if_pattern_found '/\/\*/' '/\*\//' '@license'  $f
function remove_block_if_pattern_found {
  start=$1
  end=$2
  pattern=$3
  file=$4

  # Considering everything above "package ...;" as header
  cat $file | awk '
    '$start' {rec="";f=1}
    f {rec = rec $0 ORS} !f;
    '$end' {
      if (f && (rec !~ "'$pattern'") || !f )
      printf "%s",rec; f=0
    }'
}