My regex is matching but doesnt seem to be capturing. You may recognize this from the AOC challenges.

file contains...
Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
Valve BB has flow rate=13; tunnels lead to valves CC, AA
Valve CC has flow rate=2; tunnels lead to valves DD, BB
... etc

auto s = readText(filename);
auto ctr = ctRegex!(`Valve ([A-Z]{2}).*=(\d+).+valves(,* [A-Z]{2})+`);
foreach(c;matchAll(s, ctr)) {
	fo.writeln(c);
}

produces...
["Valve AA has flow rate=0; tunnels lead to valves DD, II, BB", "AA", "0", ", BB"]
["Valve BB has flow rate=13; tunnels lead to valves CC, AA", "BB", "13", ", AA"]
["Valve CC has flow rate=2; tunnels lead to valves DD, BB", "CC", "2", ", BB"]

what I'm attempting to achieve and expect is, for instance, on the 1st line...
[....lead to valves DD, II, BB", "AA", "0", ", DD", ", II", ", BB"]

On Thursday, 6 April 2023 at 15:52:16 UTC, Paul wrote:

auto s = readText(filename);
auto ctr = ctRegex!(`Valve ([A-Z]{2}).*=(\d+).+valves(,* [A-Z]{2})+`);
foreach(c;matchAll(s, ctr)) {
	fo.writeln(c);
}

My understanding browsing the documentation is the matchAll returns a range of Captures (struct documented at https://dlang.org/phobos/std_regex.html#Captures). In your for loop I think c[0] will contain the current full match (current line that matches), c[1] will contain the first captured match ("AA" for first line), c.front[2] will contain "0" for first line, etc.

There's probably logic somewhere that decides when a Capture is used as an argument to writeln, to just print the full match (line that matches) (making writeln(capture) the same as writeln(capture[0])

On Thursday, 6 April 2023 at 16:27:23 UTC, Alex Bryan wrote:

Thanks Alex. Read some more and tried some different ways to access those repetitive ", cc" s on the end. I don't think my regex is capturing them.