How to write regex in elasticsearch "URI Search" style - regex

Question

I want to query Elasticsearch using the "URI Search" format (https://www.elastic.co/guide/en/elasticsearch/reference/current/search-uri-request.html#search-uri-request) with a regex but cannot find out how to deal with regex special characters symbols like \s and the simple space.
Let's say I have the term [ apple computer ] stored in my index (keyword analyzer used).
the term will be found with :
curl -XGET http://es:9200/myindex/mytype/_search?q=name:/.*comp.*/&pretty
curl -XGET http://es:9200/myindex/mytype/_search?q=name:/.*appl.*/&pretty
curl -XGET http://es:9200/myindex/mytype/_search?q=name:/.*pple.*/&pretty
but what syntax should I use (in curl, or with another tool) to query using these regex :
/.*pple\s+compu.*/
/.*le +compu.*/

Answer 1

I think I've found the asnwer to my question:
First with my index setting being like this, I need to use name.keyword for a full text search
{
"myindex" : {
"aliases" : { },
"mappings" : {
"mytype" : {
"properties" : {
"name" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
}
...
Then, doing a query using the "URI Search" format I have to use the tipycal conversion
a space should be written as +
+ should be written as %2b
anyother special characters in a url should be written with its %ASCII equivalent
so it turns out my regular expression /.*le +compu.*/ must be queried like that :
curl -XGET "http://es:9200/myindex/mytype/_search?q=name.keyword:/.*pple+%2bcomp.*/&pretty"
Finally, I can't see in the regexp doc or lucene any mention of the \s symbol as a wildcard for space, but not a big deal as it can be rewritten using regexp sub-patterns.