string:
Because expressions are separated by a '
;' character, and because '
$' marks the start of a path, you must use:
'
;;' when you want to insert a real '
;' character in a string,
'
$$' when you want to insert a real '
$' character in a string.
<span tal:replace="string:this is a $$100 page"/>
string:foo $bar baz
<!-- will replace $bar -->
string:foo $$bar baz
<!-- no interpolation -->
string:foo ; php:doFoo()
<!-- two different expressions -->
string:foo ;; php:doFoo()
<!-- only string -->