//replace() can be used to parse the URI. For example, to get the path:
//  path = uri.replace(regexUri, "$7$9");
 
//****************************************************//
//***************** Validate a URI *******************//
//****************************************************//
//- The different parts are kept in their own groups and can be recombined
//  depending on the scheme:
//  - http as $1://$2$7?$11#$12 or $1://$5:$6$7?$11#$12
//  - ftp as $1://$2$7 or $1://$4@$5:$6$7
//  - mailto as $1:$9?$11
//- groups are as follows:
//  1   == scheme
//  2   == authority
//  4   == userinfo
//  5   == host (loose check to allow for IPv6 addresses)
//  6   == port
//  7,9 == path (7 if it has an authority, 9 if it doesn't)
//  11   == query
//  12   == fragment
 
var regexUri = /^([a-z][a-z0-9+.-]*):(?:\/\/((?:(?=((?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9A-F]{2})*))(\3)@)?(?=(\[[0-9A-F:.]{2,}\]|(?:[a-z0-9-._~!$&'()*+,;=]|%[0-9A-F]{2})*))\5(?::(?=(\d*))\6)?)(\/(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*))\8)?|(\/?(?!\/)(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*))\10)?)(?:\?(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/?]|%[0-9A-F]{2})*))\11)?(?:#(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/?]|%[0-9A-F]{2})*))\12)?$/i;
/*composed as follows:
	^
	([a-z][a-z0-9+.-]*):									#1 scheme
	(?:
		\/\/										it has an authority:
 
		(										#2 authority
			(?:(?=((?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9A-F]{2})*))(\3)@)?		#4 userinfo
			(?=(\[[0-9A-F:.]{2,}\]|(?:[a-z0-9-._~!$&'()*+,;=]|%[0-9A-F]{2})*))\5	#5 host (loose check to allow for IPv6 addresses)
			(?::(?=(\d*))\6)?							#6 port
		)
 
		(\/(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*))\8)?			#7 path
 
		|										it doesn't have an authority:
 
		(\/?(?!\/)(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*))\10)?		#9 path
	)
	(?:
		\?(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/?]|%[0-9A-F]{2})*))\11			#11 query string
	)?
	(?:
		#(?=((?:[a-z0-9-._~!$&'()*+,;=:@\/?]|%[0-9A-F]{2})*))\12			#12 fragment
	)?
	$
*/
 
//****************************************************//
//** Validate a URI (includes delimiters in groups) **//
//****************************************************//
//- The different parts--along with their delimiters--are kept in their own
//  groups and can be recombined as $1$6$2$3$4$5$7$8$9
//- groups are as follows:
//  1,6 == scheme:// or scheme:
//  2   == userinfo@
//  3   == host
//  4   == :port
//  5,7 == path (5 if it has an authority, 7 if it doesn't)
//  8   == ?query
//  9   == #fragment
 
var regexUriDelim = /^(?:([a-z0-9+.-]+:\/\/)((?:(?:[a-z0-9-._~!$&'()*+,;=:]|%[0-9A-F]{2})*)@)?((?:[a-z0-9-._~!$&'()*+,;=]|%[0-9A-F]{2})*)(:(?:\d*))?(\/(?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*)?|([a-z0-9+.-]+:)(\/?(?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9A-F]{2})+(?:[a-z0-9-._~!$&'()*+,;=:@\/]|%[0-9A-F]{2})*)?)(\?(?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*)?(#(?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*)?$/i;
 
//****************************************************//
//***************** Validate a URL *******************//
//****************************************************//
//Validates a URI with an http or https scheme.
//- The different parts are kept in their own groups and can be recombined as
//  $1://$2:$3$4?$5#$6
//- Does not validate the host portion (domain); just makes sure the string
//  consists of valid characters (does not include IPv6 nor IPvFuture
//  addresses as valid).
 
var regexUrl = /^(https?):\/\/((?:[a-z0-9.-]|%[0-9A-F]{2}){3,})(?::(\d+))?((?:\/(?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9A-F]{2})*)*)(?:\?((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*))?(?:#((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*))?$/i;
 
//****************************************************//
//**************** Validate a Mailto *****************//
//****************************************************//
//Validates a URI with a mailto scheme.
//- The different parts are kept in their own groups and can be recombined as
//  $1:$2?$3
//- Does not validate the email addresses themselves.
 
var regexMailto = /^(mailto):((?:[a-z0-9-._~!$&'()*+,;=:@]|%[0-9A-F]{2})+)?(?:\?((?:[a-z0-9-._~!$&'()*+,;=:\/?@]|%[0-9A-F]{2})*))?$/i;