Valid URL+regex

hi, i want to implement a function that will check for validity of a URL, which user inputs in a textbox. i have to accomplish thru regular expressions (or any other methods are also acceptible).
Suppose user inputs 'http://www.yahoo.com' it will say valid url
'http://[email protected]' it should say incorrect
'http://www.yahoo+.com it should say incorrect
'http://www.yahoo.com@ it should say incorrect
i have tried to implement this but it is not working correctly
Pattern urlPattern = Pattern.compile("www\\.(.+[[a-z][0-9]&&[^~!@#$%^&*]])\\.(.+[a-z])");

I usually look on google for this kind of thing: http://www.google.co.uk/search?num=100&hl=en&ie=UTF-8&safe=off&q=%22valid+url%22+%22regular+expression%22&meta=

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Hello Friends,
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Hi,
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Regrads,
Kameshwaran A

use the onLoadError event of the moviecliploader class to check the url before applying to your scroll pane's contentPath.

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Do a malware check with some malware scanning programs. 
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* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
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Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
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How can I test if an URL is valid in Actionscript 3.0 ?

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I`m trying to make a function that tests to see if an URL is
valid and return true if it is, false otherwise, so that I can use
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return returnValue;
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_testLoader.close();
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NS/FF on Vista at this point.
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Regular expressions for URLs to match extensions

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import java.util.regex.Pattern;
public static final String urlEndSlashPattern = "/?";
public static final String urlQSPattern = "\\??([a-zA-Z0-9\\-_\\.]
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sb.append(".").append(exts).append(urlEndSlashPattern).append(urlQSPatte�rn).append(urlAnchorPattern);
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hasExt = true;
sb = new StringBuffer();
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string or an anchor or any combination of these.
Like say if I have
http://www.blah.com/index.html
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http://www.blah.com/registration/
Then I *want* to add the ".jsp" extension:
http://www.blah.com/registration.jsp
Or if I have:
http://www.blah.com/registration/?foo=bar#baz
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http://www.blah.com/registration.jsp?foo=bar#baz
But if I have
http://www.blah.com/registration/index.php?foo=bar#baz
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Hope that makes sense now. Bottom line is that the pattern above
doesn't seem to work. Ideas?
Thanks

Ok, just for fun, let's try it.
URL: http://www.blah.com/?bar=baz#anchor
Absolutely valid URL and something possible (remember, Balus, this is from a database entry, thus, it can be anything at all!)
Let's split onto the last /
Your last entry will be
?bar=baz#anchor
So if I re-insert the .jsp that it would not find I get
http://www.blah.com/.jsp?bar=baz#anchor
INVALID URL
Now let's try this one, BalusC:
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Now we split according to the ... last /
http://www.blah.com/index.jsp?forwardURL=http://www.wee.com/gotcha_balus.jsp
Valid URL, but possibly wrong when the query string value for "forwardURL" is read, thus, making the URL ultimately wrong.
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Need a regular expression for URL

Regular expression: ^(udp|norm)://(?:(?:25[0-5]|2[0-4]\\d|[01]\\d\\d|\\d?\\d)(?(?=\\.?\\d)\\.)){4}:(6553[0-5]|655[0-2][0-9]\\d|65[0-4](\\d){2}|6[0-4](\\d){3}|[1-5](\\d){4}|[1-9](\\d){0,3})$
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Getting error:java.util.regex.PatternSyntaxException: Unknown inline modifier near index 54
^(udp|norm)://(?:(?:25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)(?(?=\.?\d)\.)){4}:(6553[0-5]|655[0-2][0-9]\d|65[0-4](\d){2}|6[0-4](\d){3}|[1-5](\d){4}|[1-9](\d){0,3})$

paulcw wrote:
I can't help wondering if a simpler solution would involve creating a java.net.URL object, passing it the string to be checked, and let URL do the parsing and an initial pass at checking the syntax. Then you could query URL for individual components for further checking (e.g., getting the transfer type to make sure it's one of the kinds you want). This approach would probably be more self-documenting, if nothing else.Nice idea, but java.net.URL doesn't actually do much work at all. It basically takes the protocol part, looks up a handler for it, and delegates everything else to that. The handlers themselves are down in the sun packages (or whatever your Java impl is) and since there isn't one for the OPs protocol, he'd have to write and register his own anyway, which kind-of negates the entire purpose of leveraging it.
@OP: Paul's suggestion can still be of use. Apache, Codehaus and the like will have written their own protocol handlers, it's worth grabbing the source code for, say, Apache HttpClient, and seeing if they've got anything useful in there. Then again, who's to say that what's a valid URL for this 'norm' protocol, other than whoever designed the protocol?

Valid URL+regex

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