匹配以某些字符开头的任何字符串regex MVC DataAnnotations [英] Match any string starting with certain characters regex MVC DataAnnotations

问题描述

我是MVC DataAnnotations中的正则表达式的新手.我有一个表单，其中有一个名为Option的字段.该选项必须以CA-开头.我以不同的方式编写了正则表达式以验证该字段，并且可以使其正常工作.我尝试了所有这些:

I new to Regular Expressions in MVC DataAnnotations. I have a form that has a field named Option. The option must start with CA-. I wrote the Regular Expression in different ways to validate this field and I can get it to work. I tried all this:

[RegularExpression(@"^CA-")]
[RegularExpression(@"/CA-/")]
[RegularExpression(@"^[C]+[A]+[-]")]
[RegularExpression(@"^CA-*")]

没有一项工作.我的代码有什么问题?谢谢.

none of this work. What is wrong with my code? Thank you.

public class CA_OptionsMetadata
{
    [RegularExpression(@"^CA-", ErrorMessage = "The Option must start with CA-")]
    [Required(ErrorMessage = "Option is Required")]
    public string Option { get; set; }
    //public string Cap_LBS { get; set; }
    //public string Cap_KG { get; set; }
}

推荐答案

要在字符串的开头匹配 CA ，请使用

To match CA at the beginning of a string, use

@"^CA-.*$"

主要要点是整个字符串应该匹配( RegularExpression 必需)，因此.* $ 很重要.

The main point is that the whole string should match (it is required by the RegularExpression), thus .*$ is important.

正则表达式说明:

• ^ -字符串的开头
• CA--文字 CA-字符序列
• .* -除换行符外的零个或多个字符
• $ -字符串结尾

• ^ - start of string
• CA- - a literal CA- sequence of characters
• .* - zero or more characters other than a newline
• $ - end of string

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