iron_valid 0.4.1

Request validation library for iron, based on Laravel's validation
Documentation 
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use regex::Regex;

use params::{Map, Value};

pub fn validate_regex(values: &Map, field: &str, pattern: &str) -> Result<Option<Value>, String> {
    let pattern = match Regex::new(pattern) {
        Ok(p) => p,
        Err(_) => {
            panic!("Invalid pattern passed into Regex validator");
        }
    };

    let value = match values.find(&[field]) {
        Some(&Value::String(ref value)) => value.clone(),
        Some(&Value::U64(ref value)) => format!("{}", *value),
        Some(&Value::I64(ref value)) => format!("{}", *value),
        Some(&Value::F64(ref value)) => format!("{}", *value),
        Some(&Value::Boolean(ref value)) => format!("{}", *value),
        None => {
            // Allow empty values
            return Ok(None);
        }
        _ => {
            return Err(format!("The {} field must match the pattern \"{}\".",
                               field.to_lowercase().replace("_", " "),
                               pattern));
        }
    };

    if pattern.is_match(&value) {
        Ok(Some(Value::String(value)))
    } else {
        Err(format!("The {} field must match the pattern \"{}\".",
                    field.to_lowercase().replace("_", " "),
                    pattern))
    }
}