Asp.net validation expression for a string

Question

I want to create a regular expression for subdomain like:

In the textbox user need to enter like

abc1.test.com

or

abc1s.test.com

Note: .test.com is always required at the end.

The variable part can contain any letter, alphabets etc

I dont know anything about regex so i ask this silly question. I googled it for more than 2 hours but dont find any good example.

Please note this is not a homework.

Any help is highly appreciated.

You should probably re-phrase the qusetion title...

Sayan
– Sayan

2012-10-23 06:10:41 +00:00
Commented Oct 23, 2012 at 6:10 — Sayan
– Sayan, Commented Oct 23, 2012 at 6:10

JimmyTheOne · Accepted Answer · 2012-10-23 06:06:57Z

3

There are a number of useful resources on regex online, including:

http://regexpal.com/ - test out your regex
http://www.regular-expressions.info/reference.html - regex reference
http://www.addedbytes.com/cheat-sheets/regular-expressions-cheat-sheet/ - useful cheat sheet

I am sure other members will have better resources but these have sufficed for me in the past.

The following regex should work for you:

^((.+)(.test.com){1})$

the '.' is any character except new line
the '+' is one or more times
the '{1}' is exactly once

answered Oct 23, 2012 at 6:06

JimmyTheOne

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1 Comment

pogo Over a year ago

{1} is not required. A literal repeats itself once by default. You will need to escape the . since a . is a meta character. Your regex would match abcstestlcom. A cleaner and correct regex is ^[\d\w]+\.test\.com$

pogo · Accepted Answer · 2012-10-23 06:39:02Z

1

^[\d\w]+\.test\.com$ will work for your case.

answered Oct 23, 2012 at 6:39

pogo

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