Cannot contain "{" and "}" in the parameter text when using func (t *translator) Add(key interface{}, text string, override bool) error

[pwli0755]

Cannot contain "{" and "}" in the message when using method func (t *translator) Add(key interface{}, text string, override bool) error

I want to custom a password validitor with tag valid-password, which requires password can contains a-zA-Z0-9 and （~!@#$%^&*()[]{}|/?,.<>） only, and I'm using the universal-translator to custom the error message when validate fails. The point is when the customed error message contains "{" and "}",there will be an error!

[pwli0755]

func (t *translator) Add(key interface{}, text string, override bool) error {

	if _, ok := t.translations[key]; ok && !override {
		return &ErrConflictingTranslation{locale: t.Locale(), key: key, text: text}
	}

	lb := strings.Count(text, "{")
	rb := strings.Count(text, "}")

	if lb != rb {
		return &ErrMissingBracket{locale: t.Locale(), key: key, text: text}
	}

	trans := &transText{
		text: text,
	}

	var idx int

	for i := 0; i < lb; i++ {
		s := "{" + strconv.Itoa(i) + "}"
		idx = strings.Index(text, s)
		if idx == -1 {
			return &ErrBadParamSyntax{locale: t.Locale(), param: s, key: key, text: text}
		}

		trans.indexes = append(trans.indexes, idx)
		trans.indexes = append(trans.indexes, idx+len(s))
	}
...
}

I think the code upon caused the problem, is there any workaround? I tried \{\} but get error because \{ and \} are not valid escape characters.

[alisakotliarova]

I am having this problem as well. Additionally, if you have just one of the {} brackets it also fails.
I'm working around it by making the translation something like "{0} must not contain the characters [InvalidPasswordCharacters]" and then doing a find/replace after the translation is done to get "{0} must not contain the characters {}"

[jh125486]

Is there a reason that Go's own template var system wasn't used for interpolation (https://pkg.go.dev/text/template#hdr-Text_and_spaces), e.g. "{{0}} test string here"?