On Thursday, 6 April 2023 at 15:52:16 UTC, Paul wrote:
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**
```d
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"]**
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])
