ASP.NET MVC数据注释正则表达式

Question

I'm having trouble to get a regex to work

    [Required]
    [Display(Name = "Challonge URL")]
    [RegularExpression(@"http://challonge.com/[a-zA-Z0-9]{1-20}", ErrorMessage = "Invalid challonge URL")]
    public string Challonge_URL { get; set; }

The input http://challonge.com/56h9ezkf is not valid when it should be, is there something wrong with the regular expression?

Answer 1

Yes, there are several things...

• you need to escape / and . using \\ because slash and dot mean things in regex and you want to match them literally
• it's {1,20} , not {1-20}
• you should probably add ^ at the beginning and $ at the end so it matches the entire string; otherwise garbage at the beginning or end of the URL will be considered valid

^http:\\/\\/challonge\\.com\\/[a-zA-Z0-9]{1,20}$