CODEWITHSUNDEEP
c#.netregexunicodelatin
Andrew Johns
Andrew Johns

Reputation: 705

Preventing Cyrillic/Greek/Chinese in a string - C# 4.0

We have a system (using ASP.NET C# 4.0) that supports Greek, Cyrillic, Chinese characters. But a third party system doesn't seem to work correctly. To avoid issues when entering data for this third party system, I want to limit the text fields to accept only English or accented characters, but return a validation error for other characters.

How can I accomplish this? It seems I can use a regex along the lines of \p{Latin}, but C# doesn't seem to support this from my experience, as I get an Unknown property 'Latin' error.

Upvotes: 4

Views: 1986

Answers (1)

Martin Ender
Martin Ender

Reputation: 44259

In .NET, the Unicode block properties need to be written with Is...:

[\p{IsGreek}\p{IsCyrillic}...]

A pattern like this would detect all offending characters in your case. If you just want to exclude everything but Latin, you could do something like:

[^\p{IsBasicLatin}\p{IsLatin-1Supplement}\p{IsLatinExtended-A}\p{IsLatinExtended-B}]

This covers all code points up to U+024F.

For a list of supported block names, see MSDN.

Upvotes: 5

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