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I'm trying to use the ASP.Net Regular Expression Validator to validate a URL field. URL is www.tachibana.co.jp/tokyosys.htm. Validation expression used is ValidationExpression="http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?" but this is not working. Is there anything wrong with the Regular expression or URL ?

Rules are as below.

  1. It should validate even if (http or https) is included or not.
  2. It should also trim the URL before validating.
  3. It should also validate the sub domain URL's
  4. It should also validate the URL's to a file on domain or sub domain.

thanks

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Please mark answer if it solved your problem –  abcdefghi May 12 '11 at 13:11
 
What do you mean by trim? –  Tim Pietzcker May 12 '11 at 14:24
 
@Tim Pietzcker - It should ignore any extra space before and after the url if there is any. –  MUS May 12 '11 at 14:57
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3 Answers

up vote 3 down vote

The problem is that your regex

http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?

expects the URL to start with http:// or https://. Also, the dash inside the character class is misplaced.

Edit: Now that you've posted your rules, I suggest this:

^\s*((?:https?://)?(?:[\w-]+\.)+[\w-]+)(/[\w ./?%&=-]*)?\s*$

After a successful match, group 1 will contain the domain, and group 2 will contain the file path, if present.

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I tried it by adding http or https but still fails. URL may contain any number of dots and this may be a url to file on server (as in question) or url of the default page like msn.com –  MUS May 12 '11 at 12:35
 
the 2nd one fails to validate if i only provide msn.com in text box. –  MUS May 12 '11 at 12:38
 
Check new answer –  abcdefghi May 12 '11 at 12:57
 
@Umar: Well, what are your rules for validating a URL? You can use (http(s)?://)?([\w-]+\.)+[\w-]+(/[\w ./?%&=-]*)? but that will probably allow stuff you don't want to allow. –  Tim Pietzcker May 12 '11 at 13:20
 
i have updated the question and included the rules in it. –  MUS May 12 '11 at 13:58
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up vote 0 down vote 
^(?i)(http|ftp|https)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(/\S*)?$
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@Pankaj: thanks - First one is working but its CASE SENSITIVE. Also invalidate the url if there is any single space at the end. –  MUS May 12 '11 at 13:21
 
whole url should be case insensitive. HTTP://www.msn.com will be invalid against the given expression. It should also trim the extra space if there is any. –  MUS May 12 '11 at 13:52
1  
These expressions aren't what you need; they incorrectly limit top-level domains to 2 or 3 characters (what about .mobi or .info?), and don't seem to even try to allow for file names at all. –  Andrew Barber♦ May 12 '11 at 14:04
 
@Pankaj - There is some syntax error message in expression. –  MUS May 12 '11 at 14:14
 
I never save a website shows the url starts with HTTP://www.msn.com instead it should be like msn.com for that us can use ^(http|ftp|https)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(/\S*)?$ –  abcdefghi May 13 '11 at 5:04
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up vote 0 down vote 
"(http(s)?://)?([\www]+\.)+[\w-]+(/[\w- ;,./?%&=]*)?"
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