Test if this object doesn't contain any compiled pattern.
Regex!char r; assert(r.empty); r = regex(""); // Note: "" is a valid regex pattern. assert(!r.empty);
Getting a range of all the named captures in the regex.
import std.range; import std.algorithm; auto re = regex(`(?P<name>\w+) = (?P<var>\d+)`); auto nc = re.namedCaptures; static assert(isRandomAccessRange!(typeof(nc))); assert(!nc.empty); assert(nc.length == 2); assert(nc.equal(["name", "var"])); assert(nc[0] == "name"); assert(nc[1..$].equal(["var"]));
Regex object holds regular expression pattern in compiled form.
Instances of this object are constructed via calls to regex. This is an intended form for caching and storage of frequently used regular expressions.