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function str_word_count (str, format, charlist) {
    // Counts the number of words inside a string. If format of 1 is specified,     then the function will return an array containing all the words     found inside the string. If format of 2 is specified, then the function     will return an associated array where the position of the word is the key     and the word itself is the value.      For the purpose of this function, 'word' is defined as a locale dependent     string containing alphabetic characters, which also may contain, but not start     with "'" and "-" characters.  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/str_word_count    // +   original by: Ole Vrijenhoek
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // +   input by: Bug?
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // -   depends on: ctype_alpha
    // *     example 1: str_word_count("Hello fri3nd, you're\r\n       looking          good today!", 1);
    // *     returns 1: ['Hello', 'fri', 'nd', "you're", 'looking', 'good', 'today']
    // *     example 2: str_word_count("Hello fri3nd, you're\r\n       looking          good today!", 2);    // *     returns 2: {0: 'Hello', 6: 'fri', 10: 'nd', 14: "you're", 29: 'looking', 46: 'good', 51: 'today'}
    // *     example 3: str_word_count("Hello fri3nd, you're\r\n       looking          good today!", 1, '\u00e0\u00e1\u00e3\u00e73');
    // *     returns 3: ['Hello', 'fri3nd', 'youre', 'looking', 'good', 'today']
    var len = str.length,
        cl = charlist && charlist.length,        chr = '',
        tmpStr = '',
        i = 0,
        c = '',
        wArr = [],        wC = 0,
        assoc = {},
        aC = 0,
        reg = '',
        match = false; 
    // BEGIN STATIC
    var _preg_quote = function (str) {
        return (str + '').replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!<>\|\:])/g, '\\$1');
    },        _getWholeChar = function (str, i) { // Use for rare cases of non-BMP characters
            var code = str.charCodeAt(i);
            if (code < 0xD800 || code > 0xDFFF) {
                return str.charAt(i);
            }            if (0xD800 <= code && code <= 0xDBFF) { // High surrogate (could change last hex to 0xDB7F to treat high private surrogates as single characters)
                if (str.length <= (i + 1)) {
                    throw 'High surrogate without following low surrogate';
                }
                var next = str.charCodeAt(i + 1);                if (0xDC00 > next || next > 0xDFFF) {
                    throw 'High surrogate without following low surrogate';
                }
                return str.charAt(i) + str.charAt(i + 1);
            }            // Low surrogate (0xDC00 <= code && code <= 0xDFFF)
            if (i === 0) {
                throw 'Low surrogate without preceding high surrogate';
            }
            var prev = str.charCodeAt(i - 1);            if (0xD800 > prev || prev > 0xDBFF) { // (could change last hex to 0xDB7F to treat high private surrogates as single characters)
                throw 'Low surrogate without preceding high surrogate';
            }
            return false; // We can pass over low surrogates now as the second component in a pair which we have already processed
        };    // END STATIC
    if (cl) {
        reg = '^(' + _preg_quote(_getWholeChar(charlist, 0));
        for (i = 1; i < cl; i++) {
            if ((chr = _getWholeChar(charlist, i)) === false) {                continue;
            }
            reg += '|' + _preg_quote(chr);
        }
        reg += ')$';        reg = new RegExp(reg);
    }
 
    for (i = 0; i < len; i++) {
        if ((c = _getWholeChar(str, i)) === false) {            continue;
        }
        match = this.ctype_alpha(c) || (reg && c.search(reg) !== -1) || ((i !== 0 && i !== len - 1) && c === '-') || // No hyphen at beginning or end unless allowed in charlist (or locale)
        (i !== 0 && c === "'"); // No apostrophe at beginning unless allowed in charlist (or locale)
        if (match) {            if (tmpStr === '' && format === 2) {
                aC = i;
            }
            tmpStr = tmpStr + c;
        }        if (i === len - 1 || !match && tmpStr !== '') {
            if (format !== 2) {
                wArr[wArr.length] = tmpStr;
            } else {
                assoc[aC] = tmpStr;            }
            tmpStr = '';
            wC++;
        }
    } 
    if (!format) {
        return wC;
    } else if (format === 1) {
        return wArr;    } else if (format === 2) {
        return assoc;
    }
    throw 'You have supplied an incorrect format';
}

1

str_word_count("Hello fri3nd, you're\r\n       looking          good today!", 1);

1

['Hello', 'fri', 'nd', "you're", 'looking', 'good', 'today']

1

str_word_count("Hello fri3nd, you're\r\n       looking          good today!", 2);

1

{0: 'Hello', 6: 'fri', 10: 'nd', 14: "you're", 29: 'looking', 46: 'good', 51: 'today'}