const parameterize = string =>
  string
    .toLowerCase()
    .replace(/[^a-zA-Z0-9 -]/g, ' ') // convert unwanted chars to spaces
    .replace(/\s\s+/g, ' ')          // convert multi spaces to single space
    .replace(/\s/g, '-')             // convert spaces to hyphens
    .replace(/--+/g, '-')            // convert multi hyphens to single hyphen

parameterize('Masatoshi Nishiguchi::web developer')
parameterize('Masatoshi Nishiguchi, web developer')
parameterize('Masatoshi Nishiguchi -- web developer')
//=> "masatoshi-nishiguchi-web-developer"