SpringMongo Case insensitive search regex - regex

Question

I am trying a case insensitive search in Mongo. Basically I want case insensitive string match I am using regex. Here is my code
Query query = new Query( Criteria.where(propName).regex(value.toString(), "i"));
But the above dosent match my whole string(a string sometime with spaces). It returns values even if its a substring.
Eg: Suppose my collection has 2 values "Bill" and "Bill status',It returns me "bill" even if my search is "bill status". It returns results even if the there is a sub string of the string I am searching for
I tried Query query = new Query( Criteria.where(propName).is(value.toString()));
But the above is case sensitive. Can someone please help on this.

Answer 1

Insensitive search using regex search. input_location could be Delhi,delhi,DELHI, it works for all.
Criteria.where("location").regex( Pattern.compile(input_location, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE)));

Answer 2

The regex /^bill$/i will match just against "Bill" in a case-insensitive manner.
Here is an example showing this (in the mongo shell):
> db.foo.insert({name: "Bill"});
> db.foo.insert({name: "Bill status"});
> db.foo.insert({name: "another Bill"});
> db.foo.find()
{ "_id" : ObjectId("5018e182a499db774b92bf25"), "name" : "Bill" }
{ "_id" : ObjectId("5018e191a499db774b92bf26"), "name" : "Bill status" }
{ "_id" : ObjectId("5018e19ba499db774b92bf27"), "name" : "another Bill" }
> db.foo.find({name: /bill/i})
{ "_id" : ObjectId("5018e182a499db774b92bf25"), "name" : "Bill" }
{ "_id" : ObjectId("5018e191a499db774b92bf26"), "name" : "Bill status" }
{ "_id" : ObjectId("5018e19ba499db774b92bf27"), "name" : "another Bill" }
> db.foo.find({name: /^bill$/i})
{ "_id" : ObjectId("5018e182a499db774b92bf25"), "name" : "Bill" }
However, a regex query will not use an index, except if it is left-rooted (ie. of the form /^prefix/) and if the i case-insensitive flag is not used. You may pay a substantial performance penalty over using a query that uses an index. As such, depending on your use case, a better alternative might be to use application logic in some way, for example:
Enforce a case when you insert items into the database (e.g. convert "bill" to "Bill").
Do a search against your known case (e.g. search just against "Bill").