How would I write a regular expression (C#) which will check a given string to see if any of its characters are characters OTHER than the following:
a-z
A-Z
Æ æ Å å Ø ø - '
- unlike JavaScript, C# does not have regular expressions as part of the language. You are asking about .NET regular expressions, not c# regular expressions.John Saunders– John Saunders2010-05-29 14:49:33 +00:00Commented May 29, 2010 at 14:49
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2 Answers
new Regex("[^a-zA-ZÆæÅåØø'-]") The [] creates a character class, then ^ specifies negation, so a character matches the class if it's not one of those listed.
answered May 29, 2010 at 13:59
Matthew Flaschen
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7 Comments
kennytm
The
' should be excluded too.
David_001
Note that the - character is the last in the list. If you want more characters excluded don't add them after the -, put them before (or escape the - with backslash), otherwise the characters to the left and right of the - will be treated as a character range.
Rune FS
you can actually do "[^a-zA-ZÆ-Åæ-å'-]" to know that requires knowledge of the Danish alphabet of course :p
Matthew Flaschen
@Rune, not sure how serious you're being. That will actually throw an exception. The Unicode code point order does not match the Danish alphabet. Æ and Å are right next to each other in Unicode, but not in that order. That also means you're leaving out Ø and ø, which are later.
Rune FS
The order should be æ,ø,å that's the alphabetic order of those letters and that's the exact order in the ascii table (the Danish ASCII table).
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You can use character grouping in combination with the negation operator to achieve this.
You also need to escape the - character (and potentially the ') using a \
Your final expression would read:
[^a-zA-ZÆæÅåØø\-\']*
