Add regex literal support

[TwitchBronBron]

Adds the ability to declare regular expression literals rather than dealing with strings. Example:

regexp = /[a-z]+/i

transpiles to

regexp = CreateObject("roRegex", "[a-z]+", "i")

Tasks:

• Lexer functionality for capturing regex literals as a single token
• parser functionality
• handle escape characters e.g. /capture parens \( \)/
• transpile functionality
• user docs

[chrisdp]

Question. Should we support running the different functions inline?

https://developer.roku.com/en-ca/docs/references/brightscript/interfaces/ifregex.md#

So for example:

result = /[a-z]+/i.match(myString)

This could always be something we maybe support later but it just popped into my head.

[TwitchBronBron]

Question. Should we support running the different functions inline?

https://developer.roku.com/en-ca/docs/references/brightscript/interfaces/ifregex.md#

So for example:

result = /[a-z]+/i.match(myString)

This could always be something we maybe support later but it just popped into my head.

This SHOULD work already since it's an expression. If you can do CreateObject("roRegex", "whatever").match(my string) then this new regex literal will also support that.