Robust conversion between camelCase and hyph-en-ated text.

camelDash.js

/*!
 * Robust string conversion between
 * hyphenated 'text-string' and
 * camelCase 'textString'.
 * Allows use of '_' (underscore),
 * ' ' (space), '.' (period), and
 * '-' (hyphen) as word delimiters,
 * or an array of words.
 */


// convert from camelCase 'textString',
// or underscored 'text_string',
// or space-separated 'text string'
// or period-separated 'text.string'
// or ['array', 'of', 'separate', 'strings']
// to hyphenated 'text-string'
// optionally preserving original case where
// possible and allowing 'other' characters
// 'delim' is optional custom word delimiter
function toDashed(str, other, preserve, delim){

    if (Array.isArray(str)){
        str = str.join(' ');
        // force delim to space if 'str' is array
        delim = /\s+/;
    }
    else {
        str = str+'';
    }

    return splitWords(str, delim).map(function(word){

        // add hyphens before capital letters
        word = word.replace(/[A-Z]/g, function(c){
            return '-' + c;
        });

        // remove hyphens after capital letters
        word = word.replace(/([A-Z]\-)/g, function(c){
            return c.replace(/\-$/, '');
        });

        if (!preserve){
            word = word.toLowerCase();
        }

        if (!other){
            word = word.replace(/[^A-Za-z0-9\-]/g, '-');
        }

        return word;

    }).join('-').replace(/\-+/g, '-').replace(/^\-+|\-+$/g, '');

}


// convert from hyphenated 'text-string',
// or underscored 'text_string',
// or space-separated 'text string'
// or period-separated 'text.string'
// or ['array', 'of', 'separate', 'strings']
// to camelCase 'textString'
// optionally preserving original case where
// possible and allowing 'other' characters
// 'delim' is optional custom word delimiter
function toCamelCase(str, other, preserve, delim){

    if (Array.isArray(str)){
        str = str.join(' ');
        // force delim to space if 'str' is array
        delim = /\s+/;
    }
    else {
        str = str+'';
    }

    return splitWords(str, delim).map(function(word, i){

        if (!preserve){
            word = word.toLowerCase();
        }

        if (i > 0){
            word = word.charAt(0).toUpperCase() + word.substr(1);
        }

        if (!other){
            word = word.replace(/[^A-Za-z0-9]/g, '');
        }

        return word;

    }).join('');

}


// split string into array of words using spaces, underscores,
// hyphens, periods, commas, or 'delim' (RegExp) as word delimeters
function splitWords(str, delim){

    str = str+'';
    delim = delim || /(\s|,|_|\-|\.)+/g;

    // insert spaces between words and remove multiple spaces
    str = str.replace(delim,' ');

    // split on whitespace char.
    return str.split(/\s/);

}

I'm sure someone with better regex chops could do each of these with one line of code. That's not me, so I give you this...