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Is there a way to get the name of a captured group in C#?
string line = "No.123456789 04/09/2009 999"; Regex regex = new Regex(@"(?<number>[\d]{9}) (?<date>[\d]{2}/[\d]{2}/[\d]{4}) (?<code>.*)"); GroupCollection groups = regex.Match(line).Groups; foreach (Group group in groups) { Console.WriteLine("Group: {0}, Value: {1}", ???, group.Value); } I want to get this result:
Group: [I don´t know what should go here], Value: 123456789 04/09/2009 999 Group: number, Value: 123456789 Group: date, Value: 04/09/2009 Group: code, Value: 999
913
Some regular expression flavors allow named capture groups. Instead of by a numerical index you can refer to these groups by name in subsequent code, i.e. in backreferences, in the replace pattern as well as in the following lines of the program.
If your regular expression has named capturing groups, then you should use named backreferences to them in the replacement text. The regex (?' name'group) has one group called “name”. You can reference this group with ${name} in the JGsoft applications, Delphi, .
Mixing named and numbered capturing groups is not recommended because flavors are inconsistent in how the groups are numbered. If a group doesn't need to have a name, make it non-capturing using the (?:group) syntax. In . NET you can make all unnamed groups non-capturing by setting RegexOptions.
A part of a pattern can be enclosed in parentheses (...) . This is called a “capturing group”. That has two effects: It allows to get a part of the match as a separate item in the result array.
Use GetGroupNames to get the list of groups in an expression and then iterate over those, using the names as keys into the groups collection.
For example,
GroupCollection groups = regex.Match(line).Groups; foreach (string groupName in regex.GetGroupNames()) { Console.WriteLine( "Group: {0}, Value: {1}", groupName, groups[groupName].Value); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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