Issue #13671 has been updated by gotoken (Kentaro Goto).
Thanks shyouhei for your pointing out.
I imagine another Rexexp option, say `//I`, which is almost the same as `//i` except for never-applying SpecialCasing mapping.
This change extends Unicode matching indeed but does not introduce incompatibilities, IMHO.
A difficulty is the implementation is on the upstream library and cruby is just a user.
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Bug #13671: Regexp with lookbehind and case-insensitivity raises RegexpError only on strings with certain characters
https://bugs.ruby-lang.org/issues/13671#change-73731
* Author: dschweisguth (Dave Schweisguth)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: 2.4.1
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Here is a test program:
~~~ ruby
def test(description)
begin
yield
puts "#{description} is OK"
rescue RegexpError
puts "#{description} raises RegexpError"
end
end
test("ass, case-insensitive, special") { /(?<!ass)/i =~ '' }
test("bss, case-insensitive, special") { /(?<!bss)/i =~ '' }
test("as, case-insensitive, special") { /(?<!as)/i =~ '' }
test("ss, case-insensitive, special") { /(?<!ss)/i =~ '' }
test("ass, case-sensitive, special") { /(?<!ass)/ =~ '' }
test("ass, case-insensitive, regular") { /(?<!ass)/i =~ 'x' }
~~~
Running the test program with Ruby 2.4.1 (macOS) gives
~~~
ass, case-insensitive, special raises RegexpError
bss, case-insensitive, special raises RegexpError
as, case-insensitive, special is OK
ss, case-insensitive, special is OK
ass, case-sensitive, special is OK
ass, case-insensitive, regular is OK
~~~
The RegexpError is "invalid pattern in look-behind: /(?<!ass)/i (RegexpError)"
Side note: in the real code in which I found this error I was able to work around the error by using (?i) after the lookbehind instead of //i.
Running the test program with Ruby 2.3.4 does not report any RegexpErrors.
I think this is a regression, although I might be wrong and it might be saving me from an incorrect result with certain strings.
---Files--------------------------------
test.rb (531 Bytes)
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