Regular expressions

I have a word like this in my text,
How to searh this word using regular expressions in kibana?
and how to use regular expression for special characters?
I am using this query:

GET my_index/_search
"_source": ["file.filename"],
"query": {
"regexp": {
"content": "KRISHNA-1H3[a-zA-Z0-9]*"
"highlight": {
"fields": {
"content": {}

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