regex in oK

regex.js

  function rx(x, y, env) {
    function isNumber(str) {
      if (typeof str !== "string") return false; // Must be a string
      if (str.trim() === "") return false; // Empty string isn't a number
      return !isNaN(str) && isFinite(Number(str));
    }
    x = l(x)
      .v.map((t) => String.fromCharCode(t.v))
      .join("");
    y = l(y)
      .v.map((t) => String.fromCharCode(t.v))
      .join("");
    const rex = new RegExp(x, "g");
    const matches = [];
    for (const match of y.matchAll(rex)) {
      matches.push(
        k(3, [
          k(0, match.index),
          k(
            3,
            match[0].split("").map((m) => k(1, m.charCodeAt(0)))
          ),
          k(
            3,
            match.slice(1).map((m) =>
              isNumber(m)
                ? k(0, parseFloat(m))
                : k(
                    3,
                    m.split("").map((m1) => k(1, m1.charCodeAt(0)))
                  )
            )
          ),
        ])
      );
    }
    return k(3, matches);
  }

  verbs["rx"] = [null, null, null, null, null, rx, null, null];