I looking for this but i can't found a good solution.
I found a solution but visual studio get an error
var regexItem = new Regex(@"^[a-zA-Z0-9\_]+$);
And it's my condition:
if (regexItem.IsMatch(name))
{
//...
}
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3If i were a compiler i would complain about a missing closing quotation mark in `@"^[a-zA-Z0-9\_]+$`. – Tim Schmelter Jul 02 '15 at 11:39
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2And what is the error? – Soner Gönül Jul 02 '15 at 11:40
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with this `Regex(@"^[a-zA-Z0-9\_]+$);` the range of string is peddling and other line of coed get syntax error like : `; expected` – Jul 02 '15 at 11:45
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Do you also want to match Unicode letters? Or just Latin script only? If you also want to add Unicode support, `@"^[\w.-]+$"` will suffice in C#. – Wiktor Stribiżew Jul 02 '15 at 11:46
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if I post the above, some would come and tell that `\w` would match also some extra chars other than `A-Za-z0-9_` does. SO I always go with op's way. – Avinash Raj Jul 02 '15 at 11:50
1 Answers
8
Just include the pattern for dash and point inside the character class. And it's safe to put - at the last or at the first inside the character class.
new Regex(@"^[a-zA-Z0-9_.-]+$");
Avinash Raj
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If we want the string don't have `.` (point) in start and end what's your solution? – Jul 02 '15 at 11:59
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2`new Regex(@"^(?!\.)(?!.*\.$)(?!.*[_-]\.)(?!.*\.[-_])[a-zA-Z0-9_.-]+$");` – Avinash Raj Jul 02 '15 at 12:12
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Your solution works for me but indeed the '-' (dash) HAVE to be at the last positon. I just wanted to add ' _ ' (underscore) at the end but the '-' was no longer accepted. So, I just add the ' _ ' (underscore) before the '-' and it works. Do you know why ? – Flou Jun 22 '23 at 16:14