Validation rule: Regex characters not allowed asp.net mvc model validation

Question

For Asp.Net mvc model validation I'm trying to create a regex for the following requirement:

string length between 1-5 (including 1 and 5 limit)
non word characters are not allowed
underscore not allowed

I can write a regex witch matches the non word characters but not the inverse of my question.

Regex

Non word characters and underscore match:

([\W_])

String length between 1 and 5:

{1-5}

Asp.net mvc Code:

namespace x
{
    public class Model
    {
        [RegularExpression(@"")]
        public string AString {get;set;}
    }
}

Wiktor Stribiżew · Accepted Answer · 2016-03-14 09:35:28Z

2

You can use

^[^\W_]{1,5}$

Se the demo

The regex breakdown:

^ - start of string
[^\W_]{1,5} - not a non-word character and not a _ 1 to 5 occurrences
$ - end of string.

The [^...] is a negated character class that matches any character that is not in the character class.

Also, when you want to limit string length with a regex, you need to use some boundaries. In this case, you can rely on the usual start/end-of-string anchors.

answered Mar 14, 2016 at 9:35

Wiktor Stribiżew

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