使用 Regex.Match() 的 C# 正则表达式验证规则
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C# Regex Validation Rule using Regex.Match()
提问by nocarrier
I've written a Regular expression which should validate a string using the following rules:
我编写了一个正则表达式，它应该使用以下规则验证字符串：
- The first four characters must be alphanumeric.
- The alpha characters are followed by 6 or 7 numeric values for a total length of 10 or 11.
- 前四个字符必须是字母数字。
- 字母字符后跟 6 或 7 个数值，总长度为 10 或 11。
So the string should look like this if its valid:
因此，如果字符串有效，则该字符串应如下所示：
CCCCNNNNNN or CCCCNNNNNNN
CCCCNNNNNN 或 CCCCNNNNNNN
C being any character and N being a number.
C 是任意字符，N 是数字。
My expression is written: @"^[0-9A-Za-z]{3}[0-9A-Za-z-]\d{0,21}$";
我的表情是这样写的： @"^[0-9A-Za-z]{3}[0-9A-Za-z-]\d{0,21}$";
My regex match code looks like this:
我的正则表达式匹配代码如下所示：
var cc1 = "FOOBAR"; // should fail.
var cc2 = "AAAA1111111111"; // should succeed
var regex = @"^[0-9A-Za-z]{3}[0-9A-Za-z-]\d{0,21}$";
Match match = Regex.Match( cc1, regex, RegexOptions.IgnoreCase );
if ( cc1 != string.Empty && match.Success )
{
//"The Number must start with 4 letters and contain no numbers.",
Error = SeverityType.Error
}
I'm hoping someone can take a look at my expression and offer some feedback on improvements to produce a valid match.
我希望有人可以看看我的表达，并提供一些关于改进的反馈，以产生有效的匹配。
Also, am I use .Match()correctly? If Match.Successis true, then does that mean that the string is valid?
另外，我使用.Match()正确吗？如果Match.Success是true，那么这是否意味着该字符串有效？
采纳答案by dtb
The regex for 4 alphanumeric characters follows by 6 to 7 decimal digits is:
4 个字母数字字符后跟 6 到 7 个十进制数字的正则表达式是：
var regex = @"^\w{4}\d{6,7}$";
See: Regular Expression Language - Quick Reference
请参阅：正则表达式语言 - 快速参考
The Regex.Match Methodreturns a Matchobject. The Success Propertyindicates whether the match is successful or not.
该Regex.Match方法返回一个匹配对象。在成功物业表示是否匹配成功与否。
var match = Regex.Match(input, regex, RegexOptions.IgnoreCase);
if (!match.Success)
{
// does not match
}
回答by Qtax
Your conditions give:
你的条件给出：
- The first four characters must be alphanumeric:
[A-Za-z\d]{4} - Followed by 6 or 7 numeric values:
\d{6,7}
- 前四个字符必须是字母数字：
[A-Za-z\d]{4} - 后跟 6 或 7 个数值：
\d{6,7}
Put it together and anchor it:
把它放在一起并锚定它：
^[A-Za-z\d]{4}\d{6,7}\z
Altho that depends a bit how you define "alphanumeric". Also if you are using ignore case flag then you can remove the A-Zrange from the expression.
尽管如此，这取决于您如何定义“字母数字”。此外，如果您使用忽略大小写标志，则可以A-Z从表达式中删除范围。
回答by Bernard
Try the following pattern:
尝试以下模式：
@"^[A-za-z\d]{4}\d{6,7}$"
回答by Smi
The following code demonstrates the regex usage:
以下代码演示了正则表达式的用法：
var cc1 = "FOOBAR"; // should fail.
var cc2 = "AAAA1111111"; // should succeed
var r = new Regex(@"^[0-9a-zA-Z]{4}\d{6,7}$");
if (!r.IsMatch(cc2))
{
Console.WriteLine("cc2 doesn't match");
}
if (!r.IsMatch(cc1))
{
Console.WriteLine("cc1 doesn't match");
}
The output will be cc1 doesn't match.
输出将为cc1 doesn't match.
回答by kirti kant pareek
The following code is using a regular expression and checks 4 different patterns to test it, see output below:
以下代码使用正则表达式并检查 4 种不同的模式来测试它，请参见下面的输出：
using System;
using System.Text.RegularExpressions;
public class Program
{
public static void Main()
{
var p1 = "aaaa999999";
CheckMatch(p1);
p1 = "aaaa9999999";
CheckMatch(p1);
p1 = "aaaa99999999";
CheckMatch(p1);
p1 = "aaa999999";
CheckMatch(p1);
}
public static void CheckMatch(string p1)
{
var reg = new Regex(@"^\w{4}\d{6,7}$");
if (!reg.IsMatch(p1))
{
Console.WriteLine($"{p1} doesn't match");
}
else
{
Console.WriteLine($"{p1} matches");
}
}
}
Output:
输出：
aaaa999999 matches
aaaa9999999 matches
aaaa99999999 doesn't match
aaa999999 doesn't match
aaaa999999 匹配
aaaa9999999 匹配
aaaa99999999 不匹配
aaa999999 不匹配
Try it as DotNetFiddle
尝试作为DotNetFiddle
