Spring Expression Language dollar vs hash ($ vs #)

Question

I'm a little confused concerning when to use $ compared to #. Spring documentation only uses #.

I need to know when to use $ and when #?
Can I use # in the MVC JSP pages?

Answer 1

According to this answer:

${...} is the property placeholder syntax. It can only be used to dereference properties.

#{...} is SpEL syntax, which is far more capable and complex. It can also handle property placeholders, and a lot more besides.

Both are valid, and neither is deprecated.