1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// 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 (
"regexp"
)
// ErrMatchInvalid is the error that returns in case of invalid format.
var ErrMatchInvalid = NewError("validation_match_invalid", "must be in a valid format")
// 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,
err: ErrMatchInvalid,
}
}
// MatchRule is a validation rule that checks if a value matches the specified regular expression.
type MatchRule struct {
re *regexp.Regexp
err Error
}
// Validate checks if the given value is valid or not.
func (r MatchRule) Validate(value interface{}) error {
value, isNil := Indirect(value)
if isNil {
return nil
}
isString, str, isBytes, bs := StringOrBytes(value)
if isString && (str == "" || r.re.MatchString(str)) {
return nil
} else if isBytes && (len(bs) == 0 || r.re.Match(bs)) {
return nil
}
return r.err
}
// Error sets the error message for the rule.
func (r MatchRule) Error(message string) MatchRule {
r.err = r.err.SetMessage(message)
return r
}
// ErrorObject sets the error struct for the rule.
func (r MatchRule) ErrorObject(err Error) MatchRule {
r.err = err
return r
}
|
