📘 Wildcard and Regex queries
There are two similar operators that perform pattern matching: wildcard and regex.
Analyzer considerations
The analyzer determines what is matchable.
lucene.keyword to match across the entire string.
Any other analyzer to match across the pieces of its output.
Static prefix matters: index scan, or only prefix-matching slice scanned.
wildcard
The wildcard operator supports only two wildcard characters, ? and * which can be placed anywhere in the query string, one or more of them.
?: Matches any single character*: Matches zero or more characters
This is a useful operator to match strings starting with a particular prefix, by adding * to the end.
For example, a wildcard expression of ho* would match "horse" and "house".
regex
The regex operator supports a robust regular expression syntax, able to match sophisticated patterns against the terms of an inverted index.