Format Rules

Format rules validate common string formats such as email addresses, URLs, identifiers, JSON, IP addresses, and MAC addresses. Use them after presence rules when a missing or empty value should produce a required-style error first.

Email

Requires the value to be a valid email address.

Attribute.cs

[Email]

FluentRule.cs

RuleFor(x => x.Email)
    .Email();

HexColor

Requires the value to be a hexadecimal color value in three-, four-, six-, or eight-digit form. The leading # is required.

Attribute.cs

[HexColor]

FluentRule.cs

RuleFor(x => x.BrandColor)
    .HexColor();

Uuid

Requires the value to be a valid UUID value.

Attribute.cs

[Uuid]

FluentRule.cs

RuleFor(x => x.ExternalId)
    .Uuid();

Ulid

Requires the value to be a valid ULID value.

Attribute.cs

[Ulid]

FluentRule.cs

RuleFor(x => x.PublicId)
    .Ulid();

Ip

Requires the value to be a valid IPv4 or IPv6 address.

Attribute.cs

[Ip]

FluentRule.cs

RuleFor(x => x.ClientIp)
    .Ip();

Ipv4

Requires the value to be a valid IPv4 address.

Attribute.cs

[Ipv4]

FluentRule.cs

RuleFor(x => x.ClientIp)
    .Ipv4();

Ipv6

Requires the value to be a valid IPv6 address.

Attribute.cs

[Ipv6]

FluentRule.cs

RuleFor(x => x.ClientIp)
    .Ipv6();

MacAddress

Requires the value to be a valid MAC address.

Attribute.cs

[MacAddress]

FluentRule.cs

RuleFor(x => x.DeviceAddress)
    .MacAddress();

Json

Requires the value to be valid JSON text.

Attribute.cs

[Json]

FluentRule.cs

RuleFor(x => x.Metadata)
    .Json();

Url

Requires the value to be an HTTP or HTTPS URL.

Attribute.cs

[Url]

FluentRule.cs

RuleFor(x => x.Website)
    .Url();

Timezone

Requires the value to be a valid time zone identifier.

Attribute.cs

[Timezone]

FluentRule.cs

RuleFor(x => x.Timezone)
    .Timezone();