sed rare-delimiter (other than & | / ?…)

Question

I\'ve to apply the Unix command sed on a string (can contain #, !, /, ?, &, @ and all other characters) which can contains all types of

Answer 1

With the help of Jim Lewis, I finally did a test before using sed :

if [ `echo $1 | grep '|'` ]; then
    grep ".*$1.*:" $DB_FILE  | sed "s@^.*$1*.*\(:\)@@ "
else
    grep ".*$1.*:" $DB_FILE  | sed "s|^.*$1*.*\(:\)|| "
fi

Thanks for help