Tiny url-pattern matcher

url_matcher.coffee

###
Example:

Pattern: http{s}://example.com
Will match:
  http://example.com
  https://example.com

Pattern: http{s}://example.com/*
Will match:
  http://example.com/[anything]
  https://example.com/[anything]

Pattern: http{s}://example.*/home
Will match:
  http://example.[anything]/home
  https://example.[anything]/home

Pattern: http{s}://example.com/[hello,world]
Will match:
  http://example.com/hello[anything]
  http://example.com/world[anything]
  https://example.com/hello[anything]
  https://example.com/world[anything]

###

url_match = (url, pattern='*')->
  # trim enclosing slash(es) in url
  url     = url.replace(/([\/]*)$/g, '')
  # trim enclosing slash(es) in pattern
  pattern = pattern.replace(/([\/]*)$/g, '')
  # allow wildcard pattern: *
  pattern = pattern.replace(/\*/g, '(.+)')
  # allow `any` pattern: [a,b,c]
  pattern = pattern.replace(/\[([^\[\]]+)\]/g, (m)->
    '(' + m.replace(/(\[|\])/g,'').split(',').join('|') + ')'
  )
  # allow `optional`: {smth}
  pattern = pattern.replace(/\{([^\{\}]+)\}/g, (m)->
    '(' + m.replace(/(\{|\})/g,'') + '*)'
  )
  matcher = new RegExp("^#{pattern}", 'g')
  return matcher.test(url)