# Check if a field is a valid URL
#
# Matched against the following regular expression:
# ~~~raw
# ^(http|https):\/\/[a-zA-Z0-9\-_]+(\.[a-zA-Z0-9\-_]+)+([a-zA-Z0-9\-\.,@?^=%&:/~\+#]*[a-zA-Z0-9\-\@?^=%&/~\+#])?
# ~~~
# You should redefine the base regular expression `re` with your own.
#
# ~~~
# var validator = new ObjectValidator
# validator.add new URLField("url")
# assert not validator.validate("""{ "url": "" }""")
# assert not validator.validate("""{ "url": "foo" }""")
# assert not validator.validate("""{ "url": "http://foo" }""")
# assert validator.validate("""{ "url": "http://nitlanguage.org" }""")
# assert validator.validate("""{ "url": "http://nitlanguage.org/foo" }""")
# assert validator.validate("""{ "url": "http://nitlanguage.org/foo?q" }""")
# assert validator.validate("""{ "url": "http://nitlanguage.org/foo?q&a" }""")
# assert validator.validate("""{ "url": "http://nitlanguage.org/foo?q&a=1" }""")
# ~~~
class URLField
	super RegexField

	autoinit field, required

	redef var re = "^(http|https):\\/\\/[a-zA-Z0-9\\-_]+(\\.[a-zA-Z0-9\\-_]+)+([a-zA-Z0-9\\-\\.,@?^=%&:/~\\+#]*[a-zA-Z0-9\\-\\@?^=%&/~\\+#])?".to_re
end