Question: I am looking for way to match a very specific expression or word in my solr collection.
Here is an example :
I want the query to return me :
"Paris"
And not : "Paris is great"
And not : "I like Paris"

Thanks :)

Answer: 
If you only want exact matches, make sure the field type is defined as `string`. A `string` field will not do any tokenization or use any filters, and will only generate hits when the query is exactly the same as the value indexed.
You need to use KeywordTokenizer

> 
> This tokenizer treats the entire text field as a single token
> 
> 
> 

<https://lucene.apache.org/solr/guide/6_6/tokenizers.html#Tokenizers-KeywordTokenizer>