generateCityRegex.ts

private generateCityRegex(cityString: string): RegExp {
    const accents = {
        A: "[A,À,Á,Â,Ã,Ä,Å]",
        O: "[O,Ò,Ó,Ô,Õ,Õ,Ö,Ő]",
        E: "[E,È,É,Ê,Ë]",
        C: "[C,Ç]",
        D: "[D,Ð]",
        I: "[I,Ì,Í,Î,Ï]",
        U: "[U,Ù,Ú,Û,Ü,Ű]",
        N: "[N,Ñ]",
        S: "[S,Š]",
        Y: "[Y,Ÿ]",
        Z: "[Z,Ž]",
    };

    // const A = "[A,À,Á,Â,Ã,Ä,Å,a,à,á,â,ã,ä,å]";
    // const O = "[O,Ò,Ó,Ô,Õ,Õ,Ö,Ő,o,ò,ó,ô,õ,ö,ő]";
    // const E = "[E,È,É,Ê,Ë,e,è,é,ê,ë,ð]";
    // const C = "[C,Ç,c,ç]";
    // const D = "[D,Ð,d]";
    // const I = "[I,Ì,Í,Î,Ï,i,ì,í,î,ï]";
    // const U = "[U,Ù,Ú,Û,Ü,Ű,u,ù,ú,û,ü,ű]";
    // const N = "[N,Ñ,n,ñ]";
    // const S = "[S,Š,s,š]";
    // const Y = "[Y,Ÿ,y,ÿ,ý]";
    // const Z = "[Z,Ž,z,ž]";

    const city = cityString
        .toUpperCase()
        .split("")
        .map((c) => {
            switch (c) {
                case "A":
                    return (c = accents["A"]);
                case "O":
                    return (c = accents["O"]);
                case "E":
                    return (c = accents["E"]);
                case "C":
                    return (c = accents["C"]);
                case "D":
                    return (c = accents["D"]);
                case "I":
                    return (c = accents["I"]);
                case "U":
                    return (c = accents["U"]);
                case "N":
                    return (c = accents["N"]);
                case "S":
                    return (c = accents["S"]);
                case "Y":
                    return (c = accents["Y"]);
                case "Z":
                    return (c = accents["Z"]);
                default:
                    return c;
            }
        })
        .join("");
    return new RegExp(`^${city}`, "i");
}