popcorn :: RegexField :: re=
# Regular expression to match var re: Regex
redef var re = "(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9.-]+$)".to_re
redef var re = "(^ISBN [0-9]-[0-9]\{3\}-[0-9]\{5\}-[0-9]?$)".to_re
redef var re = "^(http|https):\\/\\/[a-zA-Z0-9\\-_]+(\\.[a-zA-Z0-9\\-_]+)+([a-zA-Z0-9\\-\\.,@?^=%&:/~\\+#]*[a-zA-Z0-9\\-\\@?^=%&/~\\+#])?".to_re