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A bit more specific pattern could be:

(\S )[\p{Zs}\t] \(([0-9] )\)

• (\S ) Capture group 1, match 1 non whitespace chars
• [\p{Zs}\t] Match 1 or more spaces (\s can also match a newline)
• \(([0-9] )\) Capture group 2, match 1 digits 0-9 between matchint the ( and )

.NET regex demo

CodePudding user response：

You did it correctly. According to .NET documentation:

the first element of the GroupCollection object (the element at index 0) returned by the Groups property contains a string that matches the entire regular expression pattern

So, regex pattern with 2 groups will return 3 results:

1. string that matches the pattern
2. 1st group
3. 2nd group