transfer json pattern capture filter configuration to yaml format, regex pattern not work?

[Lord Artois]

Hello, wonder anyone here could help

I was transfering this json to a yml format to include in the yml config 
file, but the patterns always cause a parse exception.

{
   "settings" : {
      "analysis" : {
         "filter" : {
            "code" : {
               "type" : "pattern_capture",
               "preserve_original" : 1,
               "patterns" : [
                  "(([a-z]+)(\d*))"
               ]
            }
         },
         "analyzer" : {
            "code" : {
               "tokenizer" : "pattern",
               "filter" : [ "code", "lowercase" ]
            }
         }
      }
   }
}

      code:
          type: pattern_capture
          preserve_original: false
          patterns: [/(([a-z]+)(\d*))/]

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