# sed '/[0-9]\{4,\}\|[0-9]\{1\}.*[0-9]\{1\}.*[0-9]\{1\}.*[0-9]\{1\}/d' infile

# sed '/.*[A-Za-z]\{4,\}\|[A-Za-z]\{1,\}[^A-Za-z]\{1,\}[A-Za-z]\{1,\}[A-Za-z]\{1,\}[^A-Za-z]\{1,\}\|[A-Z]\{1\}[^A-Za-z]\{1\}[A-Z]\{3,\}|\[A-Z]\{2\}[^A-Za-z]\{1,\}[A-Z]{2,\}\|[A-Z]\{3\}[^A-Za-z]\{1,\}.*\|[A-Z]\{1,\}[^A-Za-z]\{1,\}[A-Z]\{1,\}[^A-Za-z]\{1,\}[A-Z]\{1,\}[^A-Za-z]\{1,\}[A-Z]\{1,\}\|[A-Za-z]\{3\}[^A-Za-z]\{1,\}[A-Za-z]\{1,\}\|[A-Z]\{1,\} [A-Z]\{1,\} [A-Z]\{1,\}\|[A-Z]\{1,\} [^A-Z]\{1,\} [A-Z]\{1,\} [^A-Z]\{1,\} [A-Z]\{1,\} [^A-Z]\{1,\}\|^[^A-Za-z][^A-Z]*$/!d;/\b[^A-Za-z]\{1\}[A-Z]\{1\}[^A-Za-z]\{1,2\}[A-Z]\{1,2\}\|\b[A-Z]\{3\}[^ A-Z]\{1,\}\|^[A-Z] [A-Z] [A-Z]$/d' infile

### justdoit ###
# "find the line more than 3 numbers" or/and "less than 4 characters"
 
#!/bin/bash
 while read -r l
 do
   if [ $(echo "$l" | tr -d '[:alpha:]' | sed 's/ *//g' | wc -c) -gt 4 ] ; then
        `sed -i "/$l/d" infile`
   elif [ $(echo "$l" | tr -d '[:digit:]' | sed 's/ *//g' | wc -c) -lt 5 ] ; then
        `sed -i "/$l/d" infile`
   else
        echo "line has different condition->" `sed -n "/$l/p" infile`
   fi
 done < infile
 more a