// Import necessary modules
import string;
import regex;

void main()
{
    // This tests whether a pattern matches a string.
    bool match = regex::match("p([a-z]+)ch", "peach");
    print(match ? "true" : "false");

    // For other regex tasks, we'll need to create a Regex object.
    Regex@ r = regex::compile("p([a-z]+)ch");

    // Many methods are available on this object. Here's a match test like we saw earlier.
    print(r.match("peach") ? "true" : "false");

    // This finds the match for the regex.
    string result = r.search("peach punch");
    print(result);

    // This also finds the first match but returns the start and end indexes for the match.
    array<int> indices = r.search("peach punch", regex::CAPTURE_FIRST);
    print("idx: [" + indices[0] + " " + indices[1] + "]");

    // The capture variants include information about both the whole-pattern matches and the submatches.
    array<string> captures = r.capture("peach punch");
    print("[" + captures[0] + " " + captures[1] + "]");

    // To find all matches for a regex:
    array<string> allMatches = r.search("peach punch pinch", regex::GLOBAL);
    print("[" + join(allMatches, " ") + "]");

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

    // AngelScript doesn't have a direct equivalent to ReplaceAllFunc, but you can achieve similar results with a custom function.
    string input = "a peach";
    string output = r.replace(input, function(const string &in s) { return s.toupper(); });
    print(output);
}

string join(const array<string> &in arr, const string &in delimiter)
{
    string result = "";
    for (uint i = 0; i < arr.length(); i++)
    {
        if (i > 0) result += delimiter;
        result += arr[i];
    }
    return result;
}

$ angelscript regular-expressions.as
true
true
peach
idx: [0 5]
[peach ea]
[peach punch pinch]
a <fruit>
a PEACH