正则表达式验证并从字符串中提取数据

Question

I'm trying to create 2 regex in .net c#.

1. Validate that the input that the user writes has the following format one or multiple times:

Sample:

/TEXT;dd-mm-yyyy;TEXT/TEXT;dd-mm-yyyy;TEXT/TEXT;dd-mm-yyyy;TEXT

Or

/TEXT;dd-mm-yyyy;TEXT

At least 1 time should be entered. The middle part: dd-mm-yyyy should be day-month-year like 20-02-1997 In the parts TEXT there shouldn't be any / otherwise i accept that regex willfail.

2. The second regex would be to extract the "groups".

I tried with:

string test = "/TEXT;dd-mm-yyyy;TEXT/TEXT;dd-mm-yyyy;TEXT/TEXT;dd-mm-yyyy;TEXT";
            string reguexp = "[\\/(\\w+;\\w+;\\w+)+]";
            foreach (System.Text.RegularExpressions.Match match in System.Text.RegularExpressions.Regex.Matches(test, reguexp))
            {
                Console.WriteLine("'{0}' found at index {1}.", match.Value, match.Index);
            }

However is not working as detects each character as a match and i would like to extract "groups" /TEXT;dd-mm-yyyy;TEXT one by one to later do any extra data process.

I tried to start with the second regex thinking that once i have this regex the other should be easier.

Any help is accepted. Best regards

Answer 1

You should use Groups:

var strRegex = @"(?<date>\d{2}-\d{2}-\d{4})+";
var myRegex = new Regex(strRegex, RegexOptions.None);
var strTargetString = @"01-02-2000;15-03-2018";

foreach (Match myMatch in myRegex.Matches(strTargetString))
{
    var dateString = myMatch.Groups["date"].Value;

    // TODO: Check dateString is valid date (e.g. with DateTime.TryParseExact(...))
}