[ruby-core:86150] [Ruby trunk Bug#14608] Regexp::union and forward slashes

Issue #14608 has been updated by shevegen (Robert A. Heiler).


Interesting. I would have expected them to be the same.

Would be nice if it could be explained in the official docs
too at http://ruby-doc.org/core-2.5.0/Regexp.html#method-c-union

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Bug #14608: Regexp::union and forward slashes
https://bugs.ruby-lang.org/issues/14608#change-71029

* Author: jason.barnabe (Jason Barnabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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When using Regexp::union and a regular expression with a forward slash, there seem to be some inconsistencies.

~~~ ruby
# this is weird
Regexp.union(/\//, '')                  # => /(?-mix:\/)|/
Regexp.union(/\//, '') == /(?-mix:\/)|/ # => false

# here is the difference
Regexp.union(/\//, '').source           # => "(?-mix:\\/)|"
/(?-mix:\/)|/.source                    # => "(?-mix:/)|"
~~~


Previously reported at https://github.com/janosch-x/js_regex/issues/6



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