var go.opentelemetry.io/otel/trace.valueRe

2 uses

	go.opentelemetry.io/otel/trace (current package)
		tracestate.go#L45: 	valueRe         = regexp.MustCompile(`^` + valueFormat + `$`)
		tracestate.go#L67: 	if len(value) > 256 || !valueRe.MatchString(value) {