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lib/predicate/pattern.ex
defmodule Funx.Predicate.Pattern do
@moduledoc """
Predicate that checks if a string matches a regular expression pattern.
Returns false for non-strings.
Options
- `:regex` (required)
Regular expression pattern (Regex.t()).
## Examples
use Funx.Predicate
alias Funx.Predicate.Pattern
# Check if code matches pattern
pred do
check :code, {Pattern, regex: ~r/^[A-Z]{3}$/}
end
# Combined with other predicates
pred do
check :email, Required
check :email, {Pattern, regex: ~r/@/}
end
"""
@behaviour Funx.Predicate.Dsl.Behaviour
@impl true
def pred(opts) do
regex = Keyword.fetch!(opts, :regex)
fn
string when is_binary(string) -> Regex.match?(regex, string)
_non_string -> false
end
end
end