Issue #14418 has been updated by jakub.wozny (Jakub Wony).


I can't paste the code here corectly. I creted a gist with regexp: https://gist.github.com/kubaw/60ca998200d80883156fa94efa7eb6fe

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Bug #14418: ruby 2.5 slow regexp execution
https://bugs.ruby-lang.org/issues/14418#change-69972

* Author: jakub.wozny (Jakub Wony)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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I have simple regexp that performing very slow.
~~~ ruby
"fuball "*20 =~ /^([\S\s]{1000})/i
~~~

It works fast if I remove ```\i``` flag. I figured out that is also depends on string length or on quantifier value (in this case it is ```{1000}```).
When you remove `````` form the string it also works fast.

I tested on 2.3.1, 2.4.3 and 2.5.0.

I'm not sure it is a bug or it just works that way.



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