using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(=?202\d)(\d{0,3}[A-Z]{1,4}|[A-Z]{1,4}\d{1,3})([\dA-Z]{0,4})A";
string input = @"Matches R1 R2 R3 R4 R5 R6
2022A144A OK OK OK OK \D\d\d\d
20228BC3A OK OK OK OK \d\D\D\d
20228Z1DA OK OK OK OK \d\D\d\D
2022K2 A
20229999A NOK \d\d\d\d
2022B123A OK OK OK OK \D\d\d\d
20221B23A OK OK OK OK \d\D\d\d
202212B3A NOK NOK NOK OK OK \d\d\D\d
2022123BA NOK OK \d\d\d\D
2022ABCDA
2022K2 A
Matches 100% as desired
R 12 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w|\d\d\w\D|\D\D\D\D)A
R 13 ^(=?202\d)(\d{0,3}[A-Z]{1,4}|[A-Z]{1,4}\d{1,3})([\dA-Z]{0,4})A
Should match
R1: 2022\d\D\w\wA
R2: 2022\D\d\w\wA
R3: 2022(\d\D\w\w|\D\d\w\w)A
R4: 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w)A
R5: 2022(\d\D\w\w|\D\d\w\w|\d\d\D\w|\d\d\w\D)A
R 10 ^(=?202\d)(\d*[A-Z]|[A-Z]*)([\dA-Z]{1,3})A
R 11 ^(=?202\d)(\d{1,3}[A-Z]*)([\dA-Z]{1,3})A
R 12 ^(=?202\d)(\d{1,3}[A-Z]{1,3}|[A-Z]{1,3}\d{1,3})([\dA-Z]{0,3})A
^ Start of string
(?=[a-z\d]{8,}$) Positive lookahead, assert 8 or more chars a-z or digits till end of string
(?=\d*[a-z]) Positive lookahead to assert at least a char a-z
[a-z]* Match optional chars a-z
\d Match at least a single digit
[a-z\d]* Match optional chars a-z or digits
$ End of string
Should not match
R6: 2022([A-Z0-9]{1,4})A
R7: 2022(\d|\w){1,3}\wA <-- also matches 20229999A which it should not
R8: 2022\w\w\s\sA
R9 2022\d\d\d\dA";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx