CODEWITHSUNDEEP
c#asp.net
user1799214
user1799214

Reputation: 513

How to write regular expression that matches only numbers,text,spaces and only two special characters

How to write regular expression that matches only numbers,text and only these two special characters # and - [a-zA-Z0-9#-\s]+ anything else should be rejected

Upvotes: 0

Views: 2029

Answers (3)

Mhd. Yasseen
Mhd. Yasseen

Reputation: 1037

Try this:

^([a-z]|[A-Z]|[#]|[0-9]|[-])+$

Upvotes: 0

gzak
gzak

Reputation: 4110

I believe the following pattern would work in C#:

string pattern = @"^[a-zA-Z\d\s#-]*$";

I just tried a couple of test cases in C# interactive:

Regex.Match("", pattern).Success
> true
Regex.Match("asdf 2F#-#-", pattern).Success
> true
Regex.Match("asdf~asdf", pattern).Success
> false

If you don't want to accept an empty string, simply change the * to + in the pattern. Also, you didn't state that you wanted to match whitespace in your question but your example pattern does match whitespace. If you don't want to match whitespace, remove the \s.

Update: Edited per Rawling's suggestions.

Upvotes: 3

Dimitri Toonen
Dimitri Toonen

Reputation: 76

You could a regular expression similar to this

^(\d|[a-z]|[A-Z]|#|-)*$

Below the code I used for checking the regular expression in c#:

string input = @"343243-2df---ds#SFD#FD";
string pattern = @"^(\d|[a-z]|[A-Z]|#|-)*$";

Console.WriteLine(Regex.Match(input, pattern).Success);
Console.ReadLine();

Also, for future reference material, you could see this regular expression site: http://www.regular-expressions.info/

Upvotes: 3

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