How can we add message to one rule with more validation

#### Versions:
- ReactJs: #.#.#
- Ree-Validate:

### Description:

Like i have below rules:
this.validator.attach({
            name: "mobile_no",
            alias: "Mobile Number",
            rules: "required|numeric|length:10"
        });

I want to display custom message for number and length validation.

Please tell me how to do this.
