Unicode.Set.match-question-mark

You're seeing just the macro match-question-mark, go back to Unicode.Set module for more information.

match?(var, unicode_set)

(macro)

Returns a boolean based upon whether var matches the provided unicode_set.

Arguments

var is any integer variable (since codepoints are integers)
unicode_set is a binary representation of a unicode set. An exception will be raised if unicode_set is not a compile time binary

Returns

true or false

Examples

Unicode.Set.match?/2 can be used with defguard/1. For example:

defguard is_lower(codepoint) when Unicode.Set.match?(codepoint, "[[:Lu:]]")

Or as a guard clause itself:

def my_function(<< codepoint :: utf8, _rest :: binary>>)
  when Unicode.Set.match?(codepoint, "[[:Lu:]]")