package form

import (
	"regexp"

	"github.com/pkg/errors"
)

func MatchRegExp(pattern string, message string) func(f *Field) error {
	return func(f *Field) error {
		value, err := FieldAttr[string](f, "value")
		if err != nil {
			return errors.WithStack(err)
		}

		matches, err := regexp.MatchString(pattern, value)
		if err != nil {
			return errors.WithStack(err)
		}

		if !matches {
			return NewValidationError(message)
		}

		return nil
	}
}