From: nobu@...
Date: 2014-11-25T01:08:10+00:00
Subject: [ruby-core:66448] [ruby-trunk - Bug #10539] [Rejected] Wrong pattern matching when string interpolation inside regexp is used

Issue #10539 has been updated by Nobuyoshi Nakada.

Description updated
Status changed from Open to Rejected

You need parentheses.

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Bug #10539: Wrong pattern matching when string interpolation inside regexp is used
https://bugs.ruby-lang.org/issues/10539#change-50073

* Author: tammo tjarks
* Status: Rejected
* Priority: Normal
* Assignee: 
* Category: regexp
* Target version: 
* ruby -v: ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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Hello,
maybe it is my fault, but I stumble over the fact, that I get a match when I should not (have added a short example).
I use an Array to have a list of matching names like:

~~~ruby
a = ['moin','test','whatever']
~~~
and when I compare with
strings like

~~~ruby
ex_strings = ["TOMATCH moin","SHOULNDTMATCH whatever"]
~~~

I get with

~~~ruby
str =~ /TOMATCH #{a.join("|")}/
~~~
(see attached example) a match for TOMATCH moin as well
as SHOULDNTMATCH whatever. I tried it with other versions as well.
I tried it with older versions of ruby as well with the same result.
Is the use of string Interpolation inside regular expressions problematic?

Best regards,
Tammo



---Files--------------------------------
example.rb (178 Bytes)


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