No release in over a year
This small library lets you see which property values are supported by the regular expression engine of the Ruby version you are running, and what they match.
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 Project Readme

RegexpPropertyValues

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This small library lets you see which property values are supported by the regular expression engine of the Ruby version you are running and directly reads out their codepoint ranges from there.

That is, it determines all supported values for \p{value} expressions and what they match.

Usage

Browse all property values (supported by any Ruby, ever)
require 'regexp_property_values'

PV = RegexpPropertyValues

PV.all # => [<Value name='Alpha'>, <Value name='Blank'>, ...]
Browse property values supported by the Ruby you are running
PV.all_for_current_ruby # => [<Value name='Alpha'>, <Value name='Blank'>, ...]
Inspect property values
PV['alpha'].supported_by_current_ruby? # => true
PV['foobar'].supported_by_current_ruby? # => false

PV['AHex'].matched_characters # => %w[0 1 2 3 4 5 6 7 8 9 A B C ...]
PV['AHex'].matched_codepoints # => [48, 49, 50, ...]
PV['AHex'].matched_ranges # => [48..57, 65..70, 97..102]

PV['foobar'].matched_ranges # => RegexpPropertyValues::Error

If character_set is installed, you can also do this:

PV['AHex'].character_set # => #<CharacterSet: {48, 49...} (size: 22)>
Utility methods
# get a Hash of aliases for property names
PV.alias_hash # => { <Value name='M'> => <Value name='Mark'>, ... }

# download a list of possible properties for the running Ruby version
# (only used for .all and .alias_hash, not needed for prop lookup via .[])
PV.update