Asp.net Regular expression to support multiple languages

Question

I have asp.net RegularExpressionValidator
ValidationExpression="^[a-zA-Z\?*.\?!\@#\%\&\~`\$\^_\,()\//]{1,30}$" /> It will support any alpha numeric charectors excepts script tags. right now it wont supports any other language except english.

I want modify this regular expression to support arabic charectors also. Please help me how to modify this expression..

Thanks in advance..

It would help if you told us what you are trying to "validate". — Dour High Arch
– Dour High Arch, Commented May 24, 2012 at 16:10

codemonkey · Accepted Answer · 2012-05-24 15:50:07Z

1

You essentially need to change your regex from a whitelist to a blacklist. So you want to check for characters that you don't want to allow. You can achieve this by starting your regex with a ^ inside the opening bracket. So

ValidationExpression="[^\?*.\?!\@#\%\&\~`\$\^_\,()\//]"

will pass any string that does not contain the characters in the expression.

answered May 24, 2012 at 15:50

codemonkey

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2 Comments

Dour High Arch Over a year ago

I do not recommend using blacklists; they are fail-unsafe. If anything goes wrong or changes, or if your characters are ever mapped, translated, bit-stripped, or a thousand other things happen, blacklists allow invalid characters. Stick with whitelists, they are fail-safe. If a whitelist breaks it will forbid a valid character, which is annoying but not a security vulnerability.

user1352864 Over a year ago

I want to add limit the number of charector it will accept say for example it should accept only 200 charectors, since it is a asp.net TextBox(multiline)

Dour High Arch · Accepted Answer · 2012-05-24 16:59:02Z

You can add Arabic characters to regular expressions; they match themselves. One problem with Unicode is that Arabic digits, punctuation, and ornaments are scattered around in code blocks, so you may have to add specific symbols you are looking for:

ValidationExpression="^[a-zA-Z\?*.\?!\@#\%\&\~`\$\^_\,()\//\u0621-\u063F\u066E-\u06D3]{1,30}$"

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