Function validate 

pub async fn validate(
    request: &mut Request,
    rules: &[(&str, &str)],
) -> Result<Validated, Errors>

Validate a request against Laravel-style rule strings.

The shortest path from a request to trusted data: on success the validated subset comes back, on failure an Errors that already knows whether the client wanted JSON.

Panics

If a rule spec is malformed. A bad spec is a bug in the source rather than bad input from a user, and the panic carries the parser’s message — which names the rule and suggests the one that was meant. Use Rules::parse when the spec comes from data instead of from code.