1

I read a sentence:

This quick start gets you up to speed quickly with regular expressions.
Regular Expressions Quick Start

which briefly means that

This quick start helps you to speed quickly with regular expressions.

Nevertheless, the precise meaning of 'get up' is obscure for me to understand.

It's a metaphor?
Given a scene,I fell asleep without any knowledge of regular expression, then the quick start wakes me up quicker than normal speed?

3

The idiom is "to get up to speed", and can't be broken into parts:

up to speed : 1 operating at full speed. 2 (of a person or company) performing at an anticipated rate or level. 3 (of a person) fully informed or up to date.

example:

I've been tasked with updating the company website, but it'll take me a while to get up to speed on the latest JavaScript frameworks.

The metaphor is like a car accelerating on to a highway, where you try to get up to speed (as quickly as possible) in order to merge with traffic. Alternately, like a train working to get up to speed in order to move its freight most efficiently.

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