Is there a tool or website that can prevent the use of script and HTML tags in TextBoxes and TextAreas?
Updated:
public static string RegexReplace(string input, string expression, string replace)
{
return Regex.Replace(input, expression, replace);
}
public static string RemoveHTMLTags(string text)
{
return RegexReplace(text, "<[^>]*>", string.Empty);
}
One cannot completely prevent a user from inputting data in an input field. While it is possible to use javascript for validation, the user may choose to disable javascript and bypass these checks.
The best approach is to sanitize the data on the server side after the user submits it.
Consider utilizing tools like the Microsoft AntiXSS Library, or even MarkDownSharp (even if Markdown is not being used). Another option is the HtmlAgilityPack which can assist in parsing HTML.
To install HtmlAgilityPack:
PM> Install-Package HtmlAgilityPack
To install MarkDownSharp:
PM> Install-Package MarkdownSharp
To install AntiXss:
PM> Install-Package AntiXSS
It is strongly advised not to parse html with regular expressions! This could lead to significant vulnerabilities.
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