slugify.js

// Mostly cribbed together from https://gist.github.com/mathewbyrne/1280286
// Also: http://stackoverflow.com/questions/1144783/how-to-replace-all-occurrences-of-a-string-in-javascript

function _escapeRegex(str) {
    return str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
}

function slugify(str) {
    str = str.trim();
    str = str.toLowerCase();

    // Remove accented characters and other specific swaps
    var from = "àáäâèéëêìíïîòóöôùúüûñç·/_,:;=+";
    var to   = "aaaaeeeeiiiioooouuuunc--------";

    for (var i = 0, l = from.length ; i < l ; i++)
        str = str.replace(new RegExp(_escapeRegex(from.charAt(i)), 'g'), to.charAt(i));

    str = str.replace(/\s+/g, '-');         // Replace whitespace with dash
    str = str.replace(/&/g, '-and-');       // Replace & with 'and'
    str = str.replace(/\\/g, '-');          // Replace backslash with dash
    str = str.replace(/[^\w\-]+/g, '');     // Remove all non-word chars
    str = str.replace(/-+/g, '-');          // Replace multiple dashes with one
    str = str.replace(/^-+|-+$/g, '');      // Remove leading and/or trailing dashes

    return str;
};