PHP_WORDWRAP in javascript

wordwrap.js

function wordwrap( str, width, brk, cut ) {
        brk = brk || '\n';
        width = width || 75;
        cut = cut || false;

        if (!str) { return str; }

        var regex = '.{1,' +width+ '}(\\s|$)' + (cut ? '|.{' +width+ '}|.+$' : '|\\S+?(\\s|$)');

        return str.match( new RegExp(regex, 'g') ).join( brk );
    }