niki/vendor/github.com/go-ozzo/ozzo-validation/match.go

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2024-02-18 10:42:21 +00:00
// Copyright 2016 Qiang Xue. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package validation
import (
"errors"
"regexp"
)
// Match returns a validation rule that checks if a value matches the specified regular expression.
// This rule should only be used for validating strings and byte slices, or a validation error will be reported.
// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
func Match(re *regexp.Regexp) *MatchRule {
return &MatchRule{
re: re,
message: "must be in a valid format",
}
}
type MatchRule struct {
re *regexp.Regexp
message string
}
// Validate checks if the given value is valid or not.
func (v *MatchRule) Validate(value interface{}) error {
value, isNil := Indirect(value)
if isNil {
return nil
}
isString, str, isBytes, bs := StringOrBytes(value)
if isString && (str == "" || v.re.MatchString(str)) {
return nil
} else if isBytes && (len(bs) == 0 || v.re.Match(bs)) {
return nil
}
return errors.New(v.message)
}
// Error sets the error message for the rule.
func (v *MatchRule) Error(message string) *MatchRule {
v.message = message
return v
}