Validate

Package validate contains validation helpers.

struct field tag based validation helpers

Tag	Description/Constraints	Supported Types	Syntax Examples	Notes
min	Value must be greater than or equal to the minimum value specified in the tag.	Numerical, comparable types (e.g., int, float)	min:"10"	Works with numerical and comparable types like integers and floats.
max	Value must be less than or equal to the maximum value specified in the tag.	Numerical, comparable types	max:"25"	Upper-bound check for compatible types (same as min).
range	Value must fall within any of the provided ranges (OR logic between comma-separated values).	String, int/uint/float, rune	range:"..10" range:"a-z,A-Z" range:"5..10"	- Open-ended formats: ..max → ≤ max; min.. → ≥ min. - For strings: Lexical (range:"a..bb") or character ranges (range:"a-z,A-Z"). - Ranges are comma-separated and in OR logic.
char	Every character in the string must fall within specified character ranges (e.g., letters, symbols).	String, rune	char:"a-z,A-Z" char:"0-9"	Supports open-ended ranges like "A-" (characters from A to end of alphabet).
length	Constrain the length of the value (len(value) must match the condition).	string, slice, map, channel	length:"<=10" length:"5..10" length"5" len:"5"	Alias: Use len:"..." for the same effect. Works with types that have a defined len().
enum	Limits valid values to a predefined list of options.	Any type (registered or representable)	enum:"foo bar baz" enum:"foo,bar,baz"	- Uses either enum.Register for registration or direct representation in the tag. - Supports various types when registered.
regexp	Match the value agaist a regular expression.	string, []byte	regexp:"^foo$" rgx:"^foo$" match:"^foo$"	Expects Perl syntax regular expression. Aliases: rgx, match.