#!/bin/sh

swipeToQuery(){
	swipe=$1
	printf '^'
	printf "${swipe:0:2}"
	if test "${swipe:2}"; then
		printf "${swipe:2}" |grep -o . | xargs printf '\?%s'
	fi
	printf '$'
}

query(){
	swipe="$2"
	wordlist="$1"

	query=$(swipeToQuery $swipe)
	#echo "query: $query" > /dev/stderr
	grep $query "$wordlist"
}

while read -r line; do
	test "$line" && query "$1" "$line" && printf '\n'
done