Regex model validation (digits or empty string)

Question

I need to match a number of 1-5 digits or empty string for model validation:
Model:

[RegularExpression(@"\d{0,5}", ErrorMessage = "Error")]
public string ServiceNumber { get; set; }

View:

@Html.TextBoxFor(m => m.ServiceNumber)

This doesn't let me leave out the input empty.

So you're getting an error on empty string?

Jack
– Jack

2012-04-24 01:02:07 +00:00
Commented Apr 24, 2012 at 1:02 — Jack
– Jack, Commented Apr 24, 2012 at 1:02
@Jack, yes Html.ValidationSummary displays the message.

mishap
– mishap

2012-04-24 01:12:00 +00:00
Commented Apr 24, 2012 at 1:12 — mishap
– mishap, Commented Apr 24, 2012 at 1:12

Jack · Accepted Answer · 2012-04-24 01:15:16Z

1

Have you tried \d{1,5}|^$? The ^$ is an empty string because ^ is the start of the string and $ is the end of the string in regex so ^$ means start and end string with nothing inside. The | means OR, either match 1-5 digits OR empty string.

answered Apr 24, 2012 at 1:15

Jack

5,85812 gold badges52 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

hobbs Over a year ago

\d{0,5} can never fail to match.

ivancho · Accepted Answer · 2012-04-24 01:15:45Z

1

Have you tried @"(\d{1,5})?" ?

answered Apr 24, 2012 at 1:15

ivancho

8996 silver badges10 bronze badges

Collectives™ on Stack Overflow

Regex model validation (digits or empty string)

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related