A simple library to validate strings in the V language

The main purpose of this library is to validate the user input in the web applications. Due to the nature of the input in the web (it's almost always strings), the main focus is on validating strings .

Installation and Usage

The library provides a number of validators and sanitizers

Validators

Here's the full list of the currently available validators:

Validator	Description
is_bool	Checks if the string is a bool
is_eq	Checks if the string is equal to another int, float or string value
is_ne	Checks if the string is not equal to another int, float or string value
is_in	Checks if the string is in an array of allowed values
is_gt	Checks if the string is greater than another int, float or string value
is_ge	Checks if the string is greater or equal to another int, float or string value
is_lt	Checks if the string is less than another int, float or string value
is_le	Checks if the string is less or equal to another int, float or string value
is_email	Checks if the string is a valid email address
is_fqdn	Checks if the string is a Fully Qualified Domain Name
is_float	Checks if the string is a float
is_int	Checks if the string is an integer
is_ip	Checks if the string is an IP address (v4 or v6)
is_ipv4	Checks if the string is an IPv4 address
is_ipv6	Checks if the string is an IPv6 address
is_regex_match	Checks if the string matches the regular expression
is_regex_valid	Checks if regular expression syntax is correct
is_uuid	Checks if the string is a valid UUID
is_uuid_v3	Checks if the string is a valid UUID v3
is_uuid_v4	Checks if the string is a valid UUID v4
is_uuid_v5	Checks if the string is a valid UUID v5

Validation chain

All validators listed above can be used within a validation chain.

Here's the list of additional functions and methods:

Sanitizer	Description
new_chain	Returns the new validation chain
.bail	Stops running validations if any of the previous ones have failed
.validate	Runs the validation chain against the provided value
.get_errors	Returns list of the validation errors

Example usage of the chain:

mut ch := new_chain()
ch.is_gt(dst: 'a')
ch.is_le(dst: 'c')
ch.bail()
ch.is_int({}) # this won't be reached ever

assert ch.validate('z') == false

Sanitizers

Here's the full list of the currently available sanitizers:

Sanitizer	Description
to_bool	Converts the string to a boolean value
to_float	Converts the string to a float value
to_int	Converts the string to an integer value