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Go Validation Rule Index

All validators provide Not(), Or(), and OrElse(). Most rule methods also accept an optional custom message template as their last argument.

String and StringP

Section titled “String and StringP”
  • Equality and ordering: EqualTo, GreaterThan, GreaterOrEqualTo, LessThan, LessOrEqualTo, Between
  • Presence: Empty, Blank; pointer forms also have EmptyOrNil, BlankOrNil, and Nil
  • Length in bytes: MaxBytes, MinBytes, ByteLength, ByteLengthBetween
  • Length in runes: MaxLength, MinLength, Length, LengthBetween
  • Other: InSlice, MatchingTo, Passing

Deprecated string length aliases kept until v1.0: OfByteLength, OfByteLengthBetween, OfLength, and OfLengthBetween.

Numeric families

Section titled “Numeric families”

Use Int/IntP for every signed integer width, Uint/UintP for every unsigned integer width, and Float/FloatP for both floating-point widths. The width-specific numeric constructors are deprecated aliases. Rune and Byte remain available for values with those semantics.

  • Common: EqualTo, GreaterThan, GreaterOrEqualTo, LessThan, LessOrEqualTo, Between, Zero, InSlice, Passing
  • Signed integers: Positive, Negative
  • Floats: Positive, Negative, NaN, Infinite, Finite
  • Pointer variants: Nil, ZeroOrNil

Boolean

Section titled “Boolean”

EqualTo, True, False, InSlice, Passing; pointer forms also provide Nil and FalseOrNil.

Time

Section titled “Time”

EqualTo, After, AfterOrEqualTo, Before, BeforeOrEqualTo, Between, Zero, InSlice, Passing; the pointer form also provides Nil and NilOrZero.

Comparable

Section titled “Comparable”

EqualTo, InSlice, and Passing; the pointer form also provides Nil. Comparable validators do not provide ordering methods.

Typed and Any

Section titled “Typed and Any”
  • Typed: Passing, Nil
  • Any: EqualTo, Passing, Nil

The github.com/cohesivestack/valgo/is package also exposes these rules as standalone boolean functions. See Stateless Predicates.