From: duerst@...
Date: 2016-09-24T04:26:00+00:00
Subject: [ruby-core:77381] [Ruby trunk Feature#12700] regexg heredoc support

Issue #12700 has been updated by Martin D��rst.


Shyouhei Urabe wrote:
> Reopened.
> 
> Though I have never needed to write such long regexp literals inline, privately.
> Whenever I wanted multine superb regexps they are named, most likely become constants.
> For variable/constant assignments, %r perfectly works.  I doubt the actual needs of this syntax.

I'm confused. You only give arguments for rejection, but then reopen the issue.

----------------------------------------
Feature #12700: regexg heredoc support
https://bugs.ruby-lang.org/issues/12700#change-60629

* Author: Allen Morris
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
There is support for ', ", and ` heredocs, but there is no support for /.

Example code with new feature:

~~~ ruby
first = 'first'

orig = /#{first}
match\s # match
this    # match this
/x

right = <</REGEXP/x
#{first}
match\s # match
this    # match this
REGEXP

raise unless orig == right
~~~

There is no straight forward way to replace a regexp heredoc as a double quote heredoc requires that '\\s' be escaped.
As shown in the code below you can't use the string heredoc to directly replace a regexp heredoc because of this need for extra escaping.

~~~ ruby
first = 'first'

orig = /#{first}
match\s # match
this    # match this
/x

wrong = Regexp.new(<<REGEXP, Regexp::EXTENDED)
#{first}
match\s # match
this    # match this
REGEXP

right = Regexp.new(<<REGEXP, Regexp::EXTENDED)
#{first}
match\\s # match
this    # match this
REGEXP

raise unless orig != wrong
raise unless orig == right
~~~








---Files--------------------------------
regex_heredoc_patch (2.99 KB)


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