Sample code archive

Download HexGadgets^TM (1.5 MB) for use with the source code below. more info

Email Address Validation (EAV)

SimpleEmailValidation Demonstrates EAV in its simplest form.	requires	HexValidEmail
	ASP.NET, C#	download	view
	ASP.NET, VB	download	view
	ASP, VBScript	download	view	demo
	Delphi 6	download	view	screenshot
	Visual C++ 6	download	view	screenshot
	T-SQL	download	view

EmailDossier Validates and investigates email addresses.	requires	HexValidEmail
	ASP, VBScript	download	view	demo

ValidateEmail Validates email addresses with full options	requires	HexValidEmail
	ASP, VBScript	download	view	demo
	Visual Basic 6	download	view	screenshot

OptValidEmail Provides basic validation performance optimizations in a wrapper class.	requires	HexValidEmail
	ASP, VBScript	download	view
	Visual Basic 6	download	view

HexillionEmailValidator Demonstrates an ASP.NET validator control that does both client-side and server-side validation.	requires	HexValidEmail
	ASP.NET, C#	download	view	demo

Domain Name System (DNS)

Domain Check Checks availability of any domain name using Whois and DNS queries	requires	HexDns, HexTcpQuery
	ASP, VBScript	download	view	demo

MXbyHexDns Obtains MX records using HexDns.	requires	HexDns
MXbyHexDns Obtains MX records using HexDns.	Visual C++ 6	download	view	screenshot

MXbyHexValidEmail Obtains MX records using HexValidEmail.	requires	HexValidEmail
	Visual C++ 6	download	view	screenshot

NsLookup Retrieves a variety of domain resource records.	requires	HexDns
	ASP, VBScript	download	view	demo
	Visual Basic 6	download	view	screenshot

Lookup Demonstrates IP address lookups, both forward and reverse, using HexLookup.	requires	HexLookup
	ASP, VBScript	download	view	demo

LocateDomain Finds geographic location of servers using DNS LOC records	requires	HexDns
	ASP, VBScript	download	view	demo

Whois and HTTP

AutoWhois Gets Whois records automatically for domains worldwide.	requires	HexTcpQuery, HexLookup
	ASP, VBScript	download	view	demo

TcpQuery Demonstrates simple HTTP, Whois, Finger and Echo queries.	requires	HexTcpQuery, HexLookup
	ASP, VBScript	download	view	demo
	Visual Basic 6	download	view	screenshot

Diagnostics

Ping
Detects whether a host is reachable. requires HexIcmp, HexLookup

ASP, VBScript download view demo

Traceroute
Discovers a network path by incrementing TTL in ICMP packets. requires HexIcmp, HexLookup

ASP, VBScript download view demo

Visual Basic 6 download view screenshot

AnalyzePath
Does a simple, graphical traceroute requires HexIcmp, HexLookup

ASP, VBScript download view demo

Other

HexGadgetsLicenses
Displays the license status and runtime license key for each HexGadget. requires HexValidEmail, HexDns, HexIcmp,
HexTcpQuery, HexLookup

Delphi 6 download view screenshot

BrowserMirror
Shows what your browser reveals about you. requires none

ASP, VBScript download view demo

Regular Expressions

Useful expressions for client-side validation in web pages. For superior server-side validation, see the samples above.

Email address 1
Matches a limited version of the RFC 2822 addr-spec form. more details...
^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$

Email address 2
The same as above, except this requires the email address to have angle brackets and allows anything outside the angle brackets.
<(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))>

Domain name 1
Matches any legal domain name conforming to host name requirements.
^(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)*[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?$

Domain name 2
Same as #1 above, except this requires the domain to contain at least two labels.
^(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?$

Domain name 3
Same as #2 above, except this matches only realistic TLDs, i.e., those with 2 to 6 letters.
^[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.[a-zA-Z]{2,6}$

Domain name 4
Same as #2 above, except this matches specific TLDs. Use the Ignore Case option with this regex.
^[a-z0-9](?:[a-z0-9\-](?!\.)){0,61}[a-z0-9]?\.(?:com|co\.uk|com\.au)$

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