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Function `std.regex.replaceAllInto`

A variation on replaceAll that instead of allocating a new string on each call outputs the result piece-wise to the sink. In particular this enables efficient construction of a final output incrementally.


						
				void replaceAllInto(Sink, R, C, RegEx)
				(
				

				  Sink sink,
				

				  R input,
				

				  RegEx re,
				

				  const(C)[] format
				

				) @trusted
				

				if (isOutputRange!(Sink, dchar) && isSomeString!R && is(C : dchar) && isRegexFor!(RegEx, R));
				

				

				void replaceAllInto(alias fun, Sink, R, RegEx)
				(
				

				  Sink sink,
				

				  R input,
				

				  RegEx re
				

				) @trusted
				

				if (isOutputRange!(Sink, dchar) && isSomeString!R && isRegexFor!(RegEx, R));

As with replaceAll there are 2 overloads - one with a format string, the other one with a user defined functor.

Example

// insert comma as thousands delimiter in fifty randomly produced big numbers
import std.array, std.conv, std.random, std.range;
static re = regex(`(?<=\d)(?=(\d\d\d)+\b)`, "g");
auto sink = appender!(char [])();
enum ulong min = 10UL ^^ 10, max = 10UL ^^ 19;
foreach (i; 0 .. 50)
{
    sink.clear();
    replaceAllInto(sink, text(uniform(min, max)), re, ",");
    foreach (pos; iota(sink.data.length - 4, 0, -4))
        writeln(sink.data[pos]); // ','
}

Authors

Dmitry Olshansky,

API and utility constructs are modeled after the original std.regex by Walter Bright and Andrei Alexandrescu.

License

Boost License 1.0.