using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^Invoice Nr\.?\s*(?<arvenumber>[^\W_]+)[\s_]";
string input = @"...
Some nr_11687767_ other 101308591
Invoice Nr.
M230714_some text
Kirjeldus
...
Sometimes it is terminated by newline
...
This nr_11687767_KMKR_EE101308591
Invoice Nr.
M230714
01.05.2023
Item
...
or by other white space delimiter :
...
Some nr_11687767_ Text
Invoice Nr M230714 Date 01.05.2023
Desc
...";
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