[Java, MongoDB] Java Mongodb regex query

[Question]

I have to run this query in Java

 db.Users.find({"name": /^ind/i})

My Java code is

Document findQuery = new Document();
findQuery.append("name", Pattern.compile("/^"+name+"/i"));
FindIterable<Document> iterable = db.getCollection("Users").find(findQuery);

It is not returning any data, I think the above java code is converting

> /^ind/i into "/^ind/i"

Thanks in advance.

Edit:

Based on stribizhev suggestion updated the query and its worked

db.Users.find({"name": {"$regex": /^ind/, "$options": "i"}})

Java code

Document regQuery = new Document();
regQuery.append("$regex", "^(?)" + Pattern.quote(name));
regQuery.append("$options", "i");

Document findQuery = new Document();
findQuery.append("name", regQuery);
FindIterable<Document> iterable = db.getCollection("Users").find(findQuery);

[Answer]

You cannot use regex delimiters in Java Pattern.compile, as there are other means in Java (e.g. flags) to do the same.

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To enforce case-insensitive search, use inline modifier (?i). So, use "^(?i)"+Pattern.quote(name) instead of "/^"+name+"/i".

Pattern.quote just escapes all regex metacharacters so that they were treated as literals (same as \Q...\E).

[출처] https://stackoverflow.com/questions/32714333/java-mongodb-regex-query