yunusemre002

const punctuation = /[!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~\s]/g;

preprocessingWord = (word) => 
        word
            .toLowerCase()                // Convert all uppercase to lowercase
            .replace(punctuation, ' ')    // replace punctuation with space.
            .replace(/  +/g, ' ');        // Drop excess spaces.

yunusemre002

// It converts all lowercase or uppercase Turkish characters to English one on given text.

String.prototype.turkishToEnglish = function () {
    return this
        .replace(/Ğ/g, "G")
        .replace(/ğ/g, "g") 
        .replace(/Ü/g, "U") 
        .replace(/ü/g, "u") 
        .replace(/Ş/g, "S") 
        .replace(/ş/g, "s")