$regex

Returns a RegExp object.

Options

• string (optional) The regular expression string. Default '.*'.
• flags (optional) Flags for the RegExp object. Default ''.

Example

Template

{
    "expr": {
        "$regex": {
            "string": "^ab+c$",
            "flags": "i"
        }
    }   
 }

Output

{
    "expr": {
        "$regularExpression": "^ab+c$",
        "$options": "i"
    }
}