How to escape special characters in regexp

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1

How to escape special characters in regular expression query

GET my_index/_search
{

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

2

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