import std.stdio;
import std.regex;

void main()
{
    // This tests whether a pattern matches a string.
    auto match = matchFirst("peach", r"p([a-z]+)ch");
    writeln(match);

    // Above we used a string pattern directly, but for
    // other regex tasks you'll need to compile an
    // optimized Regex object.
    auto r = regex(r"p([a-z]+)ch");

    // Many methods are available on these objects. Here's
    // a match test like we saw earlier.
    writeln(matchFirst("peach", r));

    // This finds the match for the regex.
    writeln(matchFirst("peach punch", r));

    // This also finds the first match but returns the
    // start and end indexes for the match instead of the
    // matching text.
    auto m = matchFirst("peach punch", r);
    writeln("idx:", [m.pre.length, m.pre.length + m.hit.length]);

    // The matchAll function returns information about
    // both the whole-pattern matches and the submatches
    // within those matches.
    foreach(c; matchAll("peach punch pinch", r))
    {
        writeln(c.hit, " ", c[1]);
    }

    // The replaceAll function can be used to replace
    // subsets of strings with other values.
    writeln(replaceAll("a peach", r, "<fruit>"));

    // The replaceFirstIn function allows you to transform matched
    // text with a given delegate.
    string result = replaceFirstIn("a peach", r, (m) => m.hit.toUpper);
    writeln(result);
}