java simple solution
\npublic int numUniqueEmails(String[] emails) {\n\tSet<String> set = new HashSet<>();\n\tfor(String addr : emails) {\n\t\tString[] parts = addr.split("@");\n\t\
```\npublic int numUniqueEmails(String[] emails) {\n\tSet<String> set = new HashSet<>();\n\tfor(String addr : emails) {\n\t\tString[] parts = addr.split("@");\n\t\tparts[0] = parts[0].replaceAll("\\\\.", "");\n\t\tset.add(parts[0].split("\\\\+")[0]+"@"+parts[1]);\n\t}\n\treturn set.size();\n}\n```
['Java']