Web.Config rewrite rule

In IIS Web.config rewrite rule, what does a ^ and {R:0} mean? And stop processing meaning it will not proceed to the next rule?
<rule name="US site" stopProcessing="true">
<match url="^us/" />
<action type="Rewrite" url="/us/index.php/{R:0}" appendQueryString="true" />

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Boon Chye PhangAsked:
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