------------------------------------------------------ ------------------------------------------------------ Cannot be.

Matches() returns true if a value matches a provided compiled regular expression pattern.

------------------------------------------------------ ------------------------------------------------------ MaxChars() returns true if a value contains no more than n characters.

------------------------------------------------------ ------------------------------------------------------ MinChars() returns true if a value contains at least n characters.

------------------------------------------------------ ------------------------------------------------------.

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------------------------------------------------------ ------------------------------------------------------.

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------------------------------------------------------ ------------------------------------------------------ Must start with.

------------------------------------------------------ ------------------------------------------------------ Must start with.

------------------------------------------------------ ------------------------------------------------------ Must start with.

------------------------------------------------------ ------------------------------------------------------ Must start with One of.

------------------------------------------------------ ------------------------------------------------------ NotBlank() returns true if a value is not an empty string.

------------------------------------------------------ ------------------------------------------------------ PermittedInt() returns true if a value is in a list of permitted integers.

Use the regexp.MustCompile() function to parse a regular expression pattern for sanity checking the format of an email address.

------------------------------------------------------ ------------------------------------------------------ Define a new Validator type which contains a map of validation errors for our form fields.