Help with a regex pattern

How would I create a valid regex pattern to validate only the middle part of a url
ex.
www.(what I want to validate).com
. Thanks

Why isn’t this working Like I want it to?
/(\045{0}\044{0}\041{0}\042{0}\043{0}\046{0}\047{0}\050{0}\051{0}\052{0}\053{0}\054{0}\056{0}\057{0}\072{0}\73{0}\074{0}\075{0}\076{0}\077{0}\100{0}\173{0}\174{0}\175{0}\176{0}\140{0}+[a-zA-Z0-9-]+\045{0}\044{0}\041{0}\042{0}\043{0}\046{0}\047{0}\050{0}\051{0}\052{0}\053{0}\054{0}\056{0}\057{0}\072{0}\73{0}\074{0}\075{0}\076{0}\077{0}\100{0}\173{0}\174{0}\175{0}\176{0}\140{0})/,

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