refactor(rfc): abbreviate charClass and charRange

[mdjastrzebski]

Summary

Change following names to shorter:

• characterClass => charClass
• characterRange =>charRange

Motivation

The usage of characterClass & characterRange (frequently together) creates lengthy expressions.

const hexDigit = characterClass(
  characterRange('a', 'f'),
  characterRange('A', 'F'),
  characterRange('0', '9')
);

These names are much longer then other regex components (anyOf, capture, oneOrMore, etc.), yet are relatively frequently used. In order to reduce the taken space I propose using char instead of character in their names.

const hexDigit = charClass(charRange('a', 'f'), charRange('A', 'F'), charRange('0', '9'));

The char abbreviation is already used in 1st party JS APIs: e.g.,:

• String.charAt()
• String.charCodeAt()
• String.fromCharCode()

@okwasniewski, @jaworek wdyt?