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Align Regex dotall modifier to PCRE2 #14792

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Merged
merged 2 commits into from
Sep 26, 2025
Merged

Align Regex dotall modifier to PCRE2 #14792

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4132a0a
Align Regex dotall modifier to PCRE2
eksperimental Sep 25, 2025
3af87ce
Rework dotall modifiers including Erlang/OTP 28+ exclusive sequence
eksperimental Sep 25, 2025
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15 changes: 12 additions & 3 deletions lib/elixir/lib/regex.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@
# SPDX-FileCopyrightText: 2012 Plataformatec

defmodule Regex do
# TODO: Remove the "Starting from Erlang/OTP 28" part in the Modifiers'
# section once Erlang/OTP 28+ is exclusively supported.
@moduledoc ~S"""
Provides regular expressions for Elixir.

Expand Down Expand Up @@ -76,9 +78,16 @@ defmodule Regex do

* `:caseless` (i) - adds case insensitivity

* `:dotall` (s) - causes dot to match newlines and also set newline to
anycrlf; the new line setting can be overridden by setting `(*CR)` or
`(*LF)` or `(*CRLF)` or `(*ANY)` according to `:re` documentation
* `:dotall` (s) - causes dot to match newlines and also sets newline to
`(*ANYCRLF)`.\
The new line setting, as described in the [`:re` documentation](`:re`),
can be overridden by starting the regular expression pattern with:
* `(*CR)` - carriage return
* `(*LF)` - line feed
* `(*CRLF)` - carriage return, followed by line feed
* `(*ANYCRLF)` - any of the three above
* `(*ANY)` - all Unicode newline sequences
* _Starting from Erlang/OTP 28, `(*NUL)` - the NUL character (binary zero)_

* `:multiline` (m) - causes `^` and `$` to mark the beginning and end of
each line; use `\A` and `\z` to match the end or beginning of the string
Expand Down