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24 lines
597 B
C#
24 lines
597 B
C#
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using System.Text.RegularExpressions;
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WriteLine("The default regular expression checks for at least one digit.");
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do
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{
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Write("Enter a regular expression (or press ENTER to use the default): ");
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string? regexp = ReadLine();
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if (string.IsNullOrWhiteSpace(regexp))
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{
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regexp = @"^\d+$";
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}
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Write("Enter some input: ");
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string input = ReadLine()!; // will never be null
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Regex r = new(regexp);
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WriteLine($"{input} matches {regexp}: {r.IsMatch(input)}");
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WriteLine("Press ESC to end or any key to try again.");
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}
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while (ReadKey(intercept: true).Key != ConsoleKey.Escape);
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