Class diagram classifiers to not work with methods with special characters

[sambostock]

Describe the bug

Many languages sometimes allow special characters in method names. For example, Ruby uses:

• the ? suffix for "predicate methods"
• the ! suffix for "dangerous methods"

These are not well supported, and in particular cannot be combined with static and abstract method classifiers.

To Reproduce

Define a method using special characters, such as ? or !.

Expected behavior

The method name should render like any other, with the correct formatting.

It is acceptable for it to be required to surround the method name with backticks, similarly to how :: support (Ruby's namespacing/nesting syntax) was added for class names by wrapping them in backticks.

Code Sample

Code	Rendered	Live
classDiagram class `Example::Ruby::Class` { normal() predicate()? dangerous!()? static_normal()$ static_predicate?()$ static_dangerous!()$ }	classDiagram class `Example::Ruby::Class` { normal() predicate()? dangerous!()? static_normal()$ static_predicate?()$ static_dangerous!()$ } Loading

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome
• Version: Mermaid.live 9.1.6

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Similar to #1635

[jgreywolf]

Closing as duplicate of #1635