C# string should not contain only white spaces or any special character except ,.';:" [duplicate]

问题

This question already has answers here:

Combine two regular expression into one while validating Attribute (1 answer)

How do I not allow special characters, but allow space in regex? (5 answers)

Closed 10 months ago.

I need a regular expression pattern to verify string does not contain only white spaces(blank with multiple space only)(Ex: " ".length = 4) and should not contain !@$#%^&*() characters.

Regex regex = new Regex(@".\S+."); This one checks for white spaces. I need both condition in one Regex pattern.

   Result
   ---------

• " " : false
• "ad af" : true
• " asd asd " : true
• " asdf " : true
• "asdf@df dsfs " : false
• " # " : false

回答1:

As a single regex:

!Regex.IsMatch(input, "^\s+$|[!@$#%^&*()]");

This means:

^\s+$        //Is entirely composed of one or more whitespace characters 
|            //OR
[!@$#%^&*()] //Contains any one of the given special characters

This regex returns the opposite of the truth you want (i.e. it looks for anything that is all whitespace OR does contain a special char), so we NOT it with ! to match your requirements

回答2:

If you are looking for a regex for "only alphabets with space in between" you can use this:

[a-zA-Z][a-zA-Z ]+

If you want allow, numbers also, use this:

[a-zA-Z0-9][a-zA-Z0-9 ]+

来源：https://stackoverflow.com/questions/54773228/c-sharp-string-should-not-contain-only-white-spaces-or-any-special-character-exc