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issue with URL validation MVC razor and JQuery

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By User



I am working on MVC Razor. I face an issue to validate URL validation.





I need to do URL validation before inserting in temp DB.





I got a reference of http://www.regxlib.com/Search.aspx?k=&c=2&m=-1&ps=20





and found one nice validation pattern,







(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?







While i work in MVC view, it gives me error so i have change it to







(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@@?^=%&:/~\+#]*[\w\-\@@?^=%&/~\+#])?







i.e.





@@ instead of @





when it runs and if i see the console, i got the original one, so i think it is okay for me to do @@ instead of @





But in console i got an error





enter image description here





can anyone tell me what is wrong with this, so got the error,





"invalid range in character class"


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Comments

  1. Tips For AllFebruary 1, 2012 at 3:12 AM

    Easiest way to fix this: In the javascript validator, remove new RegExp() as well as the quotes, and add slashes at beginning and end, indicating a regex literal. Because your Regex is in a string, "\" is interpreted as a string escape, rather than a regex escape, essentially meaning all the "\" will be removed. You avoid that by not using a string, but a javascript regex literal:

    var urlregex = /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/;


    If creating the expression using RegExp(), you'd have to use \\ in every place \ occurs.

    As mentioned in the comment, replace two & with & (double HTML encode on server you got the regex from). They're not wrong in Regex syntax, but they do make the expression allow for ;, which isn't allowed in a URL.

    Update/explanation

    The actual meaning of the error is that because javascript ignores all the backslashes in the string when creating the final regex, it turns into:

    /(http|ftp|https)://[w-_]+(.[w-_]+)+([w-.,@?^=%&:/~+#]*[w-@?^=%&/~+#])?/



    The original [\w\-_] means "match any word (alphanumeric) character, a hyphen or an underscore".
    [w-_] means "match any character between "w" and "_".


    But "w" actually comes after "_" (look at an ASCII/UTF-8 character table) meaning it's an invalid range in the character class ("character class" = "collection of characters to match")

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