Reads all lines from a source file and for every line that matches the provided pattern(s), writes that match to a destination file to a results directory.

Optimizes for concurrency by using System.Threading.Channels.

1. Clone the repository locally.
2. Create a pattern file that contains the .NET supported regular expression patterns you'd like to use for each line.
3. Provide a source text file to read from.

dotnet run source-file.txt patterns.regex

patterns.regex is optional and will default to the above if omitted.

A "pattern" file should contain a regular expression for each line.

^\.+ end of line.
^Result: (?<output>\.+)

The above pattern file will:

1. For each line that ends in " end of line." and write them to results/pattern-1.lines.txt.

2. If the first pattern is not a match, does it start with "Result: " and if so write the output* group to results/pattern-2.lines.txt.

3. If no more patterns to match against then write the line to results/not-matched.lines.txt.

* If a pattern contains a named match called output, only that group will end up in the destination file.