static void Main(string[] args)
{
do
{
Console.WriteLine("Hello. What number range would you like to match?");
Console.WriteLine("You can write '<=AAA', '<AAA', '>=AAA', or '>AAA' or 'q' to quit.");
Console.Write("Your range: ");
string range = Console.ReadLine();
Console.WriteLine();
var numbers = Regex.Matches(range, "[\\d\\-]+").OfType <Match>().Select(m => int.Parse(m.Value)).ToList();
string pattern;
if (range.StartsWith("<=") && numbers.Count == 1)
{
pattern = GetNumberRangePattern.ForLessThanOrEqualTo(numbers[0]);
}
else if (range.StartsWith("<") && numbers.Count == 1)
{
pattern = GetNumberRangePattern.ForLessThan(numbers[0]);
}
else if (range.StartsWith(">=") && numbers.Count == 1)
{
pattern = GetNumberRangePattern.ForGreaterThanOrEqualTo(numbers[0]);
}
else if (range.StartsWith(">") && numbers.Count == 1)
{
pattern = GetNumberRangePattern.ForGreaterThan(numbers[0]);
}
else if (range.ToLower().StartsWith("q"))
{
return;
}
else
{
Console.WriteLine("Invalid format. Please try again.");
continue;
}
Console.WriteLine($"The regex pattern to match '{range}' is:");
Console.WriteLine(pattern);
Console.WriteLine();
Console.Write("What number would you like to check with this pattern? ");
var toCheck = Console.ReadLine();
var check = Regex.IsMatch(toCheck, pattern);
if (check)
{
Console.WriteLine($"Success! {toCheck} meets the condition {range}.");
}
else
{
Console.WriteLine($"No, {toCheck} does not meet the condition {range}.");
}
Console.ReadLine();
Console.Clear();
} while (true);
}
public void GreaterThanOrEqualTo_Negative_RegexDoesNotMatch_MoreNegative()
{
string pattern = GetNumberRangePattern.ForGreaterThanOrEqualTo(-123);
Assert.IsFalse(Regex.Match("-124", pattern).Success);
Assert.IsFalse(Regex.Match("-1230", pattern).Success);
Assert.IsFalse(Regex.Match("-1000", pattern).Success);
Assert.IsFalse(Regex.Match("-9999", pattern).Success);
Assert.IsFalse(Regex.Match("-999999999999999999999999999999", pattern).Success);
}
public void GreaterThanOrEqualTo_Negative_RegexMatches_Self()
{
string pattern = GetNumberRangePattern.ForGreaterThanOrEqualTo(-9);
string matchTo = "-9";
var match = Regex.Match(matchTo, pattern);
Assert.IsTrue(match.Success);
Assert.AreEqual(matchTo, match.Value);
}