$1\mathrm{.}4$ which of the following are true

Metacharacters are a specialised representation that do not self$-$match in the context of a regular expression. Instead they are used to identify or change the meaning of an expression

Regular expressions are an effective way to do pattern matching

B is an example of a metacharacter

A simple regular expression can encapsulate all types of email address formats

Regex is useful for parsing HTML and navigating the DOM structure