Try the following regex:
/zone\s+"([^"]+)".+masters\s+{[\s#\/]*([a-zA-Z0-9.-]+)[\s#\/;]*}/s
In addition to accommodating for the # and / characters in the zone stanzas, it handles the ; at the end of the masters' IP/domain name.
The last character sets:
[\s#\/]*([a-zA-Z0-9.-]+)[\s#\/;]*
^ ^ ^
| | |
| | + - Character set found immediately after I
+P/domain name
| + - Character set allowed in IP/domain name
+ - Character set found immediately before IP/domain name
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