Regular Expression Asp.Net MVC

Question

I was trying to get a user name validations where the following texts are valid,

Test
Test2
Tes2
Test123
123Test
1234
Test_56
test-6ty

But not the following

Tes (Min Length)
Test@123 (Special char)

I added following annotations in Model, though does't seem to be working for the correct texts too. Keep getting the error message.

[RegularExpression(@"^[a-zA-Z0-9\-_]$", ErrorMessage = "Only alphanumeric, hyphen and underscores are allowed for User name.")]
[StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 4)]

Are you saying that ModelState is valid when you submit with either "Tes" or "Test@123"? — user3559349
– user3559349, Commented Oct 25, 2015 at 7:51
The one for Regular Expression, "Only alphanumeric, hyphen and underscores are allowed for User name." — TBA
– TBA, Commented Oct 25, 2015 at 8:09
Your only allowing 1 character - use ^[a-zA-Z0-9\-_]*$ (or ^[a-zA-Z0-9\-_]{4, 100}$ to combine both as suggested in anubhava's answer — user3559349
– user3559349, Commented Oct 25, 2015 at 8:11

anubhava · Accepted Answer · 2015-10-25 08:00:44Z

2

From your examples it looks like this regex can be suitable for you:

@"^[a-zA-Z0-9_-]{4,10}$"

{4,10} sets minimum length of input to 4 and max length to 10. Change it whatever limits you want to keep.

answered Oct 25, 2015 at 8:00

anubhava

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