Regexp on Standard Analyzer Field

Hi, new to Elasticsearch,

is there any way to do a regex search on a field mapped by a standard analyzer.

 "message" : {
            "type" : "string",
            "analyzer" : "standard"

This is a graylog index so I cannot change the analyzer.
Can I change the analyzer in the search query somehow?

Here is a full-text response when just querying ossec with match or match_phrase:

"hosts1 ossec: Alert Level: 5; Rule: 31101 - Web server 400 error code"

I want my query response to show messages with any hostname, and any alert level from 5-9. .. so something like the below.

curl -XPOST 'localhost:9200/graylog_0/_search?pretty' -d '
  {"regexp": {"message": {
            "value": ".*ossec: Alert Level: [5-9]"

Thank you.

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