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What is the meaning of SP and HT in separators defention

In the the HTTP headers RFC I need to understand the definition of token:

token = 1* separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <"> | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT

I do not get what is the meaning of SP and HT at the end of the separators list? How to write this in a regex?

Solution

  • Both are defined in the very same RFC:

    SP = <US-ASCII SP, space (32)> HT = <US-ASCII HT, horizontal-tab (9)>