javascript input string cleanup only ALPHA

string_cleanup.js

/*
 * This file is part of the Inserm Radico package.
 *
 * @author Stéphane IBANEZ <stephane.ibanez@aezan.com>
 *
 * This class is used for cleaning input strings 
 * 1 - ' is replace by a sapce
 * 2 - All non alpha characters are removed
 * 3 - "-" is replaced by a space
 */


            var reg = new RegExp(/[^A-Za-záàâäãåçéèêëíìîïñóòôöõúùûüýÿæœÁÀÂÄÃÅÇÉÈÊËÍÌÎÏÑÓÒÔÖÕÚÙÛÜÝŸÆŒ\-\s]/gi);
            // 1 //
            $familyName = $familyName.replace(/[\'\-]/gmi, " ");
            $givenName = $givenName.replace(/[\'\-]/gmi, " ");
            // 2 //
            $familyName = $familyName.replace(reg, "");
            $givenName = $givenName.replace(reg, "");
            // 3 //
            $familyName = $familyName.replace(/\s/gi, "-");
            $givenName = $givenName.replace(/\s/gi, "-");