From: "taichi730 (Taichi Ishitani) via ruby-core" <ruby-core@...>
Date: 2022-12-28T03:39:38+00:00
Subject: [ruby-core:111468] [Ruby master Bug#19273] [Regexp] regexp does not does not match expected

Issue #19273 has been updated by taichi730 (Taichi Ishitani).


This pattern shows a binary|decimal|hexadecimal value splitted by : character.

decimal only and decimal|hexadecimal patterns match expectedly.

decimal only pattern:

```
irb(main):019:0> pattern = /(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)(?::(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)){0,3}/
=> /(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)(?::(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)){0,3}/
irb(main):020:0> "10:0:0".match(pattern)
=> #<MatchData "10:0:0">
```

decimal|hex pattern:


```
irb(main):021:0> = /(?-mix:(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))(?::(?-mix:(?-mix:[+-]?(?:[1-irb(main):021:0> pattern = /(?-mix:(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))(?::(?-mix:(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))){0,3}/
=> /(?-mix:(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))(?::(?-mix:(?-mix:[+-]?(?:[1-9]_?(?:\d_?...
irb(main):022:0> "10:0:0".match(pattern)
=> #<MatchData "10:0:0">
```

But binary|decimal pattern does not.

```
irb(main):023:0> pattern = /(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d))(?::(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d))){0,3}/
=> /(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d))(?::(?-mix:(?i-mx:[+-]?0b[01](?:_?[0...
irb(main):024:0> "10:0:0".match(pattern)
=> #<MatchData "10">

```

----------------------------------------
Bug #19273: [Regexp] regexp does not does not match expected
https://bugs.ruby-lang.org/issues/19273#change-100839

* Author: taichi730 (Taichi Ishitani)
* Status: Open
* Priority: Normal
* Assignee: make_now_just (Hiroya Fujinami)
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
A regexp pattern does not match expected with Ruby 3.2.

Ruby 3.2

``` ruby
pattern = /(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))(?::(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))){0,3}/
"10:0:0".mathc(pattern) #=> #<MatchData "10">
"0:0:0".match(pattern) #=> #<MatchData "0:0:0">
```

String "10.0.0" is only partially matched but not all of it.

Ruby 3.1.0:

```ruby
pattern = /(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))(?::(?-mix:(?i-mx:[+-]?0b[01](?:_?[01])*)|(?-mix:[+-]?(?:[1-9]_?(?:\d_?)*)?\d)|(?i-mx:[+-]?0x\h(?:_?\h)*))){0,3}/
"10:0:0".match(pattern) #=> #<MatchData "10:0:0">
"0:0:0".match(pattern) #=> #<MatchData "0:0:0">
```

Both strings matches with the regexp wholy.




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